The party, held on the Warner Bros. lot in Burbank (where DeGeneres is now taping her show, after having moved from the nearby NBC studios), was set up like a carnival – complete with 10-ft. elephant topiaries, a Ferris wheel, bumper cars, carousel, dunk tank and stilt-walkers.
Others who helped the talk-show host celebrate her landmark – which was actually back on Jan. 26 – included the Jonas Brothers, Paris Hilton and Benji Madden, David and Courtney Cox Arquette, T.R. Knight, and Tom Hanks with wife Rita Wilson.
For entertainment, Pink sang several of her hits, the dance crew ACDC performed and DJ Samantha Ronson spun tunes as guests hit the dance floor.
Snacks included red velvet cupcakes, Pinkberry yogurt, sushi and a dim sum buffet.
DeGeneres, who was accompanied by girlfriend Portia de Rossi, will share clips of the celebration on her TV show set to air Friday, May 16.