'The Smurfs 2' premieres in Los Angeles

Singers Britney Spears (L) and Katy Perry pose at the premiere of "The Smurfs 2" at the Regency Village theatre in Los Angeles, California July 28, 2013. Spears performed the song "Ooh La La" from the movie, and Perry voiced the character "Smurfette". The movie opens in the US on July 31.[Photo/Agencies]