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Taylor Swift rocked the Hollywood Bowl Friday night, with celeb guests like Gwen Stefani in attendance to support the We Can Survive breast cancer awareness charity. Iggy Azalea, Pharrell Williams, Ariana Grande and other A-listers performed as well.

In a sequined crop-top and white hot pants, the "Shake It Off" singer has been battling online piracy as of late -- songs from her upcoming album 1989 were leaked online, though her record label promptly issued cease-and-desist orders and had the songs removed from YouTube and other sites. The album will be officially released October 27.