Gwyneth Paltrow Singing Pictures at London Arts Club

Gwyneth Paltrow isn't just a patron of London's reopened Arts Club — she's also part of the entertainment! After Gwyneth and Cameron Diaz toasted their relaunch, it was time for a few glasses of red wine and speeches. Gwyneth brought her drink to a podium in the middle of the restaurant section to say a few words, then Prince Philip, the Queen's 90-year-old husband, did the same. Prince Philip also unveiled a plaque commemorating the club's 148 existence. The group, which apparently included Prince William's good pal Guy Pelly too, then moved downstairs to the Club Nouveau. Mark Ronson was first onstage with his band the Knights Before, who used to work with Amy Winehouse. When his set was over, Mark sat down at a table and charmed both Cameron and Gwyneth. Gwyneth couldn't resist hopping onstage to belt out a few medleys, including a version of Cee-Lo Green's "F*ck You." Gwyneth reportedly looked at Prince Philip afterward and, considering the foul language in the lyrics, said, "Please don't tell the Queen!"