The first two celebrities to pop into my head were Gillian Anderson and Lucy Lawless. After more thought though, I thought that I would really like to see Juliette Binoche sucking on a big strap-on cock worn by Lucy Lawless, while she was getting hammered doggy style by Chyna of former WWF fame.
I think this whole thing with Ms. Binoche comes from a recent adult film I watched that had a woman in it whose face resembled Ms. Binoche's.
Monica fucking Phoebe mercilessly while Rachel (tied and helpless) watches in horror. Monica looks at Rachel and keeps telling her that she's next and, yo be different, is going to get it up the ass. Rachel begs for mercy as Phoebe cums against her will...
How about the women of Destiny's Child taking their turns with Britney Spears? They could turn her into their slave and poke all of her holes for the finale of one of their concerts.