Katy Perry revealed at the premiere of The Smurfs 2 in L.A. this weekend that she secretly recorded backing vocals on Britney Spears' "Ooh La La"!
The catchy pop tune was written by frequent Perry collaborator Bonnie McKee.
"Me and Bonnie secretly did background vocals on that song," Perry said.
"So maybe listen for our voices."
Will Katy Perry and Britney Spears collaborate on a real duet sometime soon? We can only hope, but in the meantime, listen to their unofficial one above.