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Katy Perry made quite an entrance at the Life Ball on Sunday when she was lowered onstage in a giant shell! The Brit American singer donned a sea-themed dress with shell bustier, the skirt ripped off to reveal her studded, diamanté, hotpantsuit, complete with ornamental starfish. Eva Longoria and Bill Clinton also attended the event, held to help people suffering from HIV and AIDs. As well as Perry, Pamela Anderson strutted her stuff onstage, in a performance with a specially-customised ghetto blaster. Jump through to see more images from the event, including Katy in her marine vessel.

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Amanda Lepore, left, and a befrocked Pamela Anderson earlier on in the night.