The wedding ring and the engagement ring are seen on Britain's Catherine, Duchess of Cambridge, at Buckingham Palace in London. REUTERS/Ian West/Pool

Prince William drives a car from Buckingham palace to Clarence house as his new wife Catherine, Duchess of Cambridge, sits next to him after their wedding in London April 29, 2011. REUTERS/Nir Elias

A combination photo shows a selection of photos taken during the Royal wedding between Britain's Prince William and Catherine, Duchess of Cambridge, in London April 29, 2011. REUTERS/Staff

Prince William and his new wife Catherine, Duchess of Cambridge, are seen on their way to Buckingham palace after they got married in Westminster Abbey in London April 29, 2011. REUTERS/Nir Elias

Britain's Prince William meets New Zealand's Prime Minister John Key and his wife Bronagh Key at Buckingham Palace in London April 29, 2011. REUTERS/Ian West

Catherine, Duchess of Cambridge meets New Zealand's Prime Minister John Key and his wife Bronagh Key at Buckingham Palace in London April 29, 2011. REUTERS/Ian West/POOL

Britain's Prince William and his wife Catherine, Duchess of Cambridge drive from Buckingham Palace in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Dylan Martinez

The numberplate of the Aston Martin DB6 Mark 2 driven by Britain's Prince William with his wife Catherine, Duchess of Cambridge from Buckingham Palace after their wedding in Westminster Abbey, is seen in central London April 29, 2011. REUTERS/Dylan Martinez

Britain's Prince William and his wife Catherine, Duchess of Cambridge drive from Buckingham Palace in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Max Nash/Pool

Britain's Prince William and his wife Catherine, Duchess of Cambridge, drive from Buckingham Palace along The Mall in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Ronen Zvulun

Britain's Queen Elizabeth and Prince Philip travel to Buckingham palace after the wedding of Prince William and Kate Middleton in central London April 29, 2011. REUTERS/Nir Elias

Crowds cheer as Prince William and Catherine, Duchess of Cambridge, appear on the balcony of Buckingham Palace after they got married in Westminster Abbey in London April 29, 2011. REUTERS/Nir Elias

Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss as they stand on the balcony at Buckingham Palace with other members of their families, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Darren Staples

Britain's Prince William, and Kate Middleton stand before the Archbishop of Canterbury, Rowan Williams, during their wedding ceremony in Westminster Abbey, in central London April 29, 2011. REUTERS/Dave Thompson/Pool

Britain's Prince Harry, page boy Tom Pettifer and bridesmaid Eliza Lopes make the journey by carriage procession to Buckingham Palace following the Royal wedding at Westminster Abbey in London April 29, 2011. REUTERS/Pool

Britain's Prince William helps his wife Catherine, Duchess of Cambridge, to leave the 1902 State Landau carriage as they arrive at Buckingham Palace after their wedding in Westminster Abbey in central London April 29, 2011. REUTERS/Andrew Winning

Buckingham Palace in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Paul Hackett

Crowds cheer as Prince William and Catherine, Duchess of Cambridge, appear on the balcony of Buckingham Palace after they got married in Westminster Abbey in London April 29, 2011. REUTERS/Nir Elias

Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony of Buckingham Palace, following following their wedding at Westminster Abbey in London April 29, 2011. REUTERS/John Stillwell/Pool

General view inside the Westminster Abbey as Kate Middleton arrives with her father Michael (L) for her marriage to Britain's Prince William in central London April 29, 2011. Sarah Burton, of Alexander McQueen, who designed the wedding dress, stands to the right of Kate Middleton as she makes final adjustments to the dress. REUTERS/Suzanne Plunkett

Britain's Prince William and Catherine, Duchess of Cambridge travel to Buckingham Palace in the 1902 State Landau, along the Procession Route, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Kieran Doherty

Britain's Prince William and his wife Catherine, Duchess of Cambridge, travel in the 1902 State Landau carriage to Buckingham Palace, after their wedding ceremony at Westminster Abbey in London April 29, 2011. REUTERS/Matt Cardy/Pool

A detail of Prince William and his wife Catherine, the Duchess of Cambridge's eight tiered wedding cake, made by Fiona Cairns and her team, is photographed in the Picture Gallery inside Buckingham Palace in London April 29, 2011. REUTERS/John Stillwell/Pool

Britain's Prince William and his wife Catherine, Duchess of Cambridge wave from the balcony of Buckingham Palace, following following their wedding at Westminster Abbey in London April 29, 2011. REUTERS/John Stillwell/Pool

Bridesmaid Grace van Cutsem closes her ears during the fly past as she stands near Britain's Prince William and his wife Catherine, Duchess of Cambridge, (both not seen) on the balcony at Buckingham Palace with other members of the Royal Family, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Darren Staples

The daughters of Earl Spencer sit in the pews ahead of Britain's Prince William to and Kate Middleton, at Westminster Abbey in central London April 29, 2011. REUTERS/Dave Thompson/Pool

Britain's Prince William helps his wife Catherine, Duchess of Cambridge, as they leave Westminster Abbey and travel to Buckingham Palace in the 1902 State Landau, along the Procession Route, after their wedding in central London April 29, 2011. REUTERS/Toby Melville

Britain's Prince William, walks with his new wife Catherine, Duchess of Cambridge, past British Singer Elton Joyhn and his partner david Furnish, after their wedding ceremony in Westminster Abbey, in central London April 29, 2011. REUTERS/Adrian Dennis/Pool

Britain's Prince William and Catherine, Duchess of Cambridge, leave the Westminster Abbey after their wedding ceremony, in central London April 29, 2011. REUTERS/Suzanne Plunkett

Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony at Buckingham Palace, watched by bridemaids Grace van Cutsem and Margarita Armstrong-Jones and pageboy Tom Pettifer, after their wedding in Westminster Abbey, April 29, 2011. REUTERS/Dylan Martinez

Britain's Prince William and his wife Catherine, Duchess of Cambridge, kiss as they stand on the balcony at Buckingham Palace with other members of the Royal Family, after their wedding in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday REUTERS/Darren Staples

Michael Middleton, lifts the veil off of his daughter Kate, as she stands next to her future husband, Britain's Prince William, during their wedding ceremony In Westminster Abbey, in central London April 29, 2011. REUTERS/Kirsty Wigglesworth/Pool

Britain's Prince William and his wife Catherine, Duchess of Cambridge, are seen before they kiss on the balcony at Buckingham Palace with other members of the Royal Family, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/Darren Staples

Britain's Queen Elizabeth, her husband Prince Philip and Pippa Middleton stand on the balcony of Buckingham Palace, following the wedding of Britain's Prince William and Kate Middleton at Westminster Abbey in London April 29, 2011. REUTERS/John Stillwell/Pool

Britain's Prince William and his wife Catherine, Duchess of Cambridge, walk up the aisle, followed by Prince Harry and Maid of Honour Pippa Middleton, Bridesmaids and Page Boys, after their wedding ceremony in Westminster Abbey, in central London April 29, 2011. REUTERS/Dave Thompson/Pool

Britain's Prince William and his wife Catherine, Duchess of Cambridge, travel to Buckingham Palace in the 1902 State Landau, along the Procession Route, after their wedding in Westminster Abbey, April 29, 2011. REUTERS/Tony Gentile

Britain's Prince William and his wife Catherine, Duchess of Cambridge, travel to Buckingham Palace in the 1902 State Landau, along the Procession Route, after their wedding in Westminster Abbey, April 29, 2011. REUTERS/Phil Noble

Britain's Prince William and Catherine, Duchess of Cambridge walk after their wedding ceremony in Westminster Abbey in central London April 29, 2011. REUTERS/Kai Pfaffenbach

Britain's Prince William, and Catherine, Duchess of Cambridge travel to Buckingham Palace in the 1902 State Landau, along the Procession Route, after their wedding in Westminster Abbey, April 29, 2011. REUTERS/Phil Noble

Britain's Prince William and Catherine, Duchess of Cambridge, look at one another after their wedding ceremony in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday. REUTERS/Toby Melville

Kate Middleton waves from a a Rolls Royce on her way to Westminster Abbey for her marriage to Britain's Prince William, in central London April 29, 2011. REUTERS/Tony Gentile

Britain's Prince William and Catherine, Duchess of Cambridge, look at one another after their wedding ceremony in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday. REUTERS/Toby Melville

Britain's Prince William and his wife Catherine, Duchess of Cambridge, leave after their wedding ceremony in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday. REUTERS/Kai Pfaffenbach

Britain's Prince William, and Kate Middleton sit during their wedding ceremony In Westminster Abbey, in central London April 29, 2011. REUTERS/Anthony Devlin/Pool

Britain's Prince William (L), and his brother and best man Prince Harry, arrive to Westminster Abbey for Prince William's marriage to Kate Middleton, in central London April 29, 2011. (REUTERS/Phil Noble)

Soccer star David Beckham and his wife Victoria arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Kai Pfaffenbach)

Britain's Prince William, and Kate Middleton exchange rings before the Archbishop of Canterbury, Rowan Williams, during their wedding ceremony In Westminster Abbey, in central London April 29, 2011. REUTERS/Dominic Lipinski/Pool

Kate Middleton arrives with her father Michael at Westminster Abbey before her marriage to Britain's Prince William in central London April 29, 2011. At bottom, Maid of Honour Pippa Middleton, the sister of Kate Middleton. REUTERS/Suzanne Plunkett

Maid of Honour Pippa Middleton (second left), the sister of Kate Middleton, speaks to Stephen Lamport, Receiver General of Westminster Abbey, surrounded by bridesmaids and page boys inside the Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton in central London April 29, 2011. REUTERS/Suzanne Plunkett

Kate Middleton waves as she travels in a Rolls Royce to Westminster Abbey for her marriage to Britain's Prince William, in central London April 29, 2011. REUTERS/Tony Gentile

James Middleton, the brother of Kate Middleton, leaves the Goring Hotel to travel to Westminster Abbey for Kate's marriage to Britain's Prince William, in central London April 29, 2011. (Reuters/Joel Ryan/Pool)

Guests arrive at the wedding of Prince William and Catherine Middleton at Westminster Abbey, London, England, April 29, 2011. (Anthony Stanley/WENN)

Members of the general congregation arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Anthony Devlin/Pool)

Socialite Tara Palmer-Tomkinson arrives at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Phil Noble)

London Mayor Boris Johnson (C) arrives at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Kai Pfaffenbach)

Earl Spencer, brother to the late Princess Diana, speaks with guests at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Anthony Devlin/Pool)

Britain's Prime Minister David Cameron arrives at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Phil Noble)

Britain's Deputy Prime Minister Nick Clegg and his wife Miriam Gonzalez Durantez, arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Phil Noble)

Speaker of the House of Commons John Bercow and his wife Sally (R) arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Toby Melville)

Sir Elton John arrives at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. (REUTERS/Kai Pfaffenbach)

Pippa Middleton, sister of the bride Kate Middleton arrives to the wedding of Britain's Prince William and Kate Middleton in central London April 29, 2011. (REUTERS/Kai Pfaffenbach)

Kate Middleton arrives at Westminster Abbey before Kate's marriage to Britain's Prince William in central London April 29, 2011. REUTERS/Toby Melville

Singer Elton John and his partner David Furnish wait after taking their seats for the Royal wedding of Prince William and Kate Middleton at Westminster Abbey in London April 29, 2011. REUTERS/Jon Bond/POOL

Chelsy Davy (left) leaves Westminster Abbey after the wedding of Britain's Prince William and his wife Catherine, Duchess of Cambridge, in central London April 29, 2011. REUTERS/Fiona Hanson/Pool

British footballer David Beckham and his wife Victoria attend the wedding of Britain's Prince William and Kate Middleton at Westminster Abbey in central London April 29, 2011. REUTERS/Adrian Dennis/Pool

Kate Middleton walks down the isle accompanied by her father Michael Middleton at Westminster Abbey during her wedding to Prince William in London April 29, 2011. REUTERS/Pool

British film director Guy Ritchie and his girlfriend Jacqui Ainsley attend the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. REUTERS/Kirsty Wigglesworth/Pool

Britain's Prime Minister David Cameron gestures before the wedding of Prince William and Kate Middleton at Westminster Abbey in London April 29, 2011. REUTERS/Pool

Samantha Cameron, wife of Britain's Prime Minister David Cameron, leaves after the wedding ceremony of Prince William and Kate Middleton at Westminster Abbey, in central London, April 29, 2011. REUTERS/Toby Melville

Guests leave the Westminster Abbey after the wedding ceremony of Britain's Prince William and his wife Catherine, Duchess of Cambridge, in central London April 29, 2011. REUTERS/Suzanne Plunkett

Britain's Prince Andrew and his daughters Princess Beatrice and Princess Eugenie travel along the Procession Route, after the wedding of Britain's Prince William and Catherine, Duchess of Cambridge in Westminster Abbey, in central London April 29, 2011. REUTERS/Warren Allott/Pool