Katy Perry is not pregnant. The 'Teenage Dream' pop genius took to Twitter early this morning to tweet the truth in response to some fan questions: nope, she and funny hubby Russell Brand are not expecting a little bubblegum pop baby anytime soon. Also on Twitter, Keri Hilson quoted the great Cee Lo Green's 'F--- You' track, while Jennifer Hudson, Hayley Williams of Paramore and Diddy dished out some decent tweet advice to their thousands of followers.