Kesha

Kesha
Artist: Britney Spears Song: "Till The World Ends" (2011) Kesha was a pop star in her own right when she passed along this track to Britney Spears - a decision she stands by even after the song sold over a million copies. “It really solidifies me as a songwriter in the pop music world, which is what I consider myself first and foremost," she explained. [Photo via]
4 of 8