The bosses at Internet search engine site Yahoo.com have teamed up with U.S. news show Access Hollywood to offer Prince William and his bride-to-be Kate Middleton tips for a happy marriage.

The couple will wed in London at the end of April and now well-wishers can officially offer the royals advice.

Access Hollywood launched the project on Wednesday with messages from movie royal Dame Helen Mirren and Glee star Jane Lynch.

The Queen star Mirren said, "The pressures on them are going to be so different. I don't know how any marriage can survive those pressures, quite honestly, without a real, unbelievable sense of self-discipline and duty... The trick... is to give the other person as much freedom as possible.

"Freedom to be who and what they want to be. You're there to support the other person, not to control them, to push them into being something that you want them to be."

And lesbian Lynch added, "They're going to be doing a lot of things outside (the marriage) and they have a lot of duties other than the duties to their marriage... but what happens at home is important.

"What I love about them is they're not going to have the help; they're not going to have the butlers and the maids... They're going to keep it simple."

Lynch, who wed Lara Embry last year, admits she was personally asked by bosses at Yahoo to help them launch their marriage advice site.

She adds, "We're a same sex couple and we've been kind of out there as kind of an example and we were really thrilled that they asked asked us and we take that responsibility seriously. We know a lot of people are looking to us."