Katy Perry Bashes Russell Brand in New Revenge Song at Grammys

A fiery Katy Perry took the stage at Sunday's Grammy Awards in L.A. and, instead of performing one of her many well-known hits, she used the opportunity to debut a new song, "Part of Me" -- a ditty not-so-subtly aimed at her soon-to-be ex Brand, 36, who blindsided her last December by filing for divorce after 14 months of marriage.

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