Take that, Russell Brand!
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.



