Photo SpecialSummer's Hottest 'Action Stars'
Zac Efron makes waves! Carrie Underwood plays ball! Plus: Who rocked a mechanical rhino?
Credit: Erika Goldring/FilmMagic
Updated: Monday Aug 16, 2010 | 06:00 AM EDT By: Alison Schwartz
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LADY GAGA
The singer shows her Chicago fans some rock-star hospitality – by stage-diving into the audience at the 2010 Lollapalooza festival in August.
