<p>Singers Katy Perry and Britney Spears' voice will be heard in one song in the forthcoming movie "Smurfs 2".<br /><br /></p>.<p>The song "Ooh la la" is sung by Spears and written by Bonnie McKee. Perry's vocals are in the background, reports eonline.com.<br /><br />"Me and Bonnie secretly did some background vocals on that song. So maybe listen for our voices," Perry said at the movie's premiere here.<br /><br />However, Perry hasn't had a chance to meet Spears in person, and said: "I can't wait to meet her."</p>
<p>Singers Katy Perry and Britney Spears' voice will be heard in one song in the forthcoming movie "Smurfs 2".<br /><br /></p>.<p>The song "Ooh la la" is sung by Spears and written by Bonnie McKee. Perry's vocals are in the background, reports eonline.com.<br /><br />"Me and Bonnie secretly did some background vocals on that song. So maybe listen for our voices," Perry said at the movie's premiere here.<br /><br />However, Perry hasn't had a chance to meet Spears in person, and said: "I can't wait to meet her."</p>