Robbie Williams and ex-Spice Girl Geri Halliwell teamed up during a recent show.
The U.K. pop star also performed the new song at a small concert for 1,000 people in London on Thursday night, NME.com reports.
Tickets for the intimate show were on sale only through Deutsche Bank, which sponsored the concert. Thirty pairs of tickets were also given away on Robbie's website.
The new song was called "Women". During the rest of Robbie's on hour and 40 minute show, he played his hits "Let Me Entertain You," "Kids" and "She's The One".
As the concert was drawing to a close, Geri came onstage to give Robbie a kiss.
Proceeds from the show went to UNICEF and Robbie's own charity, called Give It Sum.
