Roberto Cavalli topped off a busy week at Cannes by hosting the Life Ball in Vienna on Saturday. Raising over $2.5 million for AIDS research, the event included a live performance by Adam Lambert and speeches by Sir Elton John and Bill Clinton. But the costumes were the real highlight of the evening, which had a “One Thousand and One Nights” theme, complete with performers dressed as lions — not that anyone needed an excuse to go shirtless. Click through our slideshow to see Amanda Lepore, Carmen Electra, Karolina Kurkova, and other folks rubbing shoulders with the former president in their best Aladdin getups.