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, Jayden 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 premiere included Neil Patrick Harris and Jayma Mays, who both stopped to talk to POPSUGAR at the event. Stay tuned for their interviews!
Katy was very excited to meet Britney at the event, and even tweeted a photo of the duo sharing a hug, writing, "OMG! I can't, I'm crying!" Despite the happy tears, this isn't Katy's first time encountering Britney, so to speak. She revealed at the premiere that she secretly sang background vocals on Britney's new single for the film, "Ooh La La." Katy said, "Me and [songwriter] Bonnie McKee secretly did some background vocals on that song. So maybe listen for our voices."