Katy Perry's 2012 GRAMMY Revenge Song

Posted Monday February 13, 2012 10:21 AM GMT

Never one to disappoint her fans, Katy Perry brought the thunder as she took the stage at the 54th Annual Grammy Awards last night (February 12).

The “Hot N Cold” singer began with her hit song “E.T.” before launching into a brand new single “Part of Me” that released on iTunes today.

One listen to the lyrics of “Part of Me” and it’s obvious that she wrote it as a response to her doomed marriage to Russell Brand.

Prior to the performance, a Perry pal told press, "Katy has a huge surprise in store and everyone is going to be talking about it. It’s going to be totally epic. She can’t wait for Sunday and everyone is so excited for her to show that the split hasn’t taken away her spirit and it’s only made her stronger.”

Photo Credit: Getty Images