Gwyneth Paltrow sings for Prince Philip

Prince Philip, Queen Elizabeth's husband, is 90. So you'll understand why his birthday festivities included performances from Mark Ronson and Amy Winehouse's backing band The Knight Before -- fronted on this special occasion by trans-Atlantic transplant, Gwyneth Paltrow.

During her umpteenth on-record rendition of Cee-Lo Green's "F*** You," she actually used the F-bomb, according to E! Online, before quickly adding, "Don't tell the queen!"

Cameron Diaz was also reportedly on hand for the shindig. The Daily Mail reports that the shindig was actually more of a grand re-opening party for the exclusive Arts Club in London's swanky Mayfair district.

Not spotted: The Queen or Paltrow's husband, Coldplay frontman Chris Martin. People will talk.