Here they all are jetting off for their fun-filled week-end.

Couples Paris Hilton, Josh Henderson, Nicky Hilton, David Katzenberg and a couple other pals head out for Jason Strauss'birthday party at Tao in The Venetian.

While there, they ran into Britney's ex K-FED.

All I have to say is, what ever good thoughts I had about K-FED are just plain gone. What an a$$hole to pose with her. One ...