"Who Knew" is a song by American recording artist and songwriter Pink, which was taken from her fourth studio album I'm Not Dead (2006). The song was written by Pink, Max Martin and Lukasz Gottwald, while it was produced by Max Martin and Dr. Luke.
http://en.wikipedia.org/wiki/Who_Knew
http://en.wikipedia.org/wiki/I'm_Not_Dead_(album)
http://en.wikipedia.org/wiki/Pink
http://en.wikipedia.org/wiki/Who_Knew
http://en.wikipedia.org/wiki/I'm_Not_Dead_(album)
http://en.wikipedia.org/wiki/Pink