It appears Katy Perry won’t be the only pop star in The Smurfs 2. says Britney Spears will lend her vocals to the end credits song Ooh La La. Spears’ Femme Fatale collaborators Lukasz “Dr. Luke” Gottwald and Ammo Cirkut produced the track, while Bonnie McKee, J Kash, Lola Blanc and Fransisca Hall each received a writing credit. “I have always loved the Smurfs as a kid, and now my boys are the biggest Smurfs fans ever,” Spears said in a press statement. “I wanted to surprise them with a song in the movie. I know they’ll think it’s Smurftastic!” The Smurfs 2 opens July 31.