Britney Spears + Katy Perry Collaborate on Song, Hang at ‘Smurfs 2′ Premiere [Pictures]
Britney Spears and Katy Perry are forever linked by 'The Smurfs 2' -- and not just because Brit Brit sings 'Ooh La La' (the ending credits song) and Perry voices Smurfette in the flick. Perry actually sang backup on 'Ooh La La,' too! True story.
The song was penned by Bonnie McKee, who is working with Perry on her follow-up to 'Teenage Dream,' and who is making a go of it as a solo artist in her own right! And that's how Perry's voice ended up as that of a background vocalist.
"Me and Bonnie secretly did some background vocals on that song," Perry told E! at the film's premiere this weekend. "So maybe listen for our voices."
Um, you bet we will. We will tune our sonar for Perry's vox in the song!