If you're in need of a breakup anthem, look no further than Katy Perry's latest. Titled "Part of Me," the leaked song is a surprisingly upbeat tune that samples similar beats to "California Gurls." The message in a nutshell: even though you broke up with me, you won't bring me down. Atta girl. It's reportedly a leftover from the singer's recording sessions from Teenage Dream, but wherever it came from, I'm liking it! Give it a spin when you read more.