Katy Perry Has a Fangirl Moment With Britney Spears at the Smurfs 2 Premiere

Pop worlds collided at the Smurfs 2 premiere in LA today when Britney Spears met up with Katy Perry on the blue carpet. Both of the stars made the event a family affair, with Britney bringing her two sons Jaden and Sean to the bash and Katy posing for photographers with her grandma, Ann Hudson. This isn't the first time that Katy's grandmother has made a trip down a red carpet as she's also attended the 2011 Grammy Awards with her superstar granddaughter. Other celebrity guests at the Smurfs 2 p...