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Singer Britney Spears and son Sean Federline attend the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174721529 )

Actor George Lopez poses for a photo at the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (Photo by John Shearer/Invision/AP) ( World Premiere of The Smurfs 2 - Blue Carpet )

Britney Spears, center, with sons Sean Federline and Jayden James Federline arrives at the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (Photo by Jordan Strauss/Invision/AP) ( World Premiere of The Smurfs 2 - Arrivals )

Actor Jacob Tremblay attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174721733 )

Actress/Singer Katy Perry and grandmother Ann Hudson attends the premiere of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Frazer Harrison/Getty Images) ( 174717058 )

Katy Perry poses for a photo at the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (Photo by John Shearer/Invision/AP) ( World Premiere of The Smurfs 2 - Blue Carpet )

Actress/Singer Katy Perry attends the premiere Of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Alberto E. Rodriguez/Getty Images) ( 174717253 )

Singer Katy Perry, who voiced the character of "Smurfette", poses at the premiere of "The Smurfs 2" at the Regency Village theatre in Los Angeles, California July 28, 2013. The movie opens in the U.S. on July 31. REUTERS/Mario Anzuoni ( USA/ )

Actor George Lopez attends the premiere of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Frazer Harrison/Getty Images) ( 174725309 )

Dannielynn Marshall, left, and Larry Birkhead arrive at the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (Photo by Jordan Strauss/Invision/AP) ( World Premiere of The Smurfs 2 - Arrivals )

Actor Neil Patrick Harris (2nd-L), David Burtka (2nd-R), Harper Grace Burtka-Harris (L), and Gideon Scott Burtka-Harris (R) attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174722075 )

Actor Neil Patrick Harris arrives to the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (Photo by John Shearer/Invision/AP) ( World Premiere of The Smurfs 2 - Blue Carpet )

Actor George Lopez attends the premiere of Columbia Pictures' 'Smurfs 2' at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Frazer Harrison/Getty Images) ( 174726233 )

Actress/Singer Katy Perry and Ann Hudson attend the premiere Of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Alberto E. Rodriguez/Getty Images) ( 174721911 )

Actress/Singer Katy Perry attends the premiere of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Jason Merritt/Getty Images) ( 174719087 )

Producer Jordan Kerner attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174721898 )

Actor Anton Yelchin attends the premiere of Columbia Pictures' 'Smurfs 2' at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Frazer Harrison/Getty Images) ( 174731468 )

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 U.S. on July 31. REUTERS/Mario Anzuoni ( USA/ )

Actress/singer Katy Perry attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174719018 )

TV personality Nancy O'Dell attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174719585 )

Actor J.B. Smoove premiere of Columbia Pictures' "Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Frazer Harrison/Getty Images) ( 174725348 )

Actress Bonnie McKee attends the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174719745 )

Eric West attends "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174719414 )

Yaya DaCosta attends "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174719518 )

June Ambrose attends "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174714888 )

Debi Mazar attends "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174717024 )

Fatima Ptacek attends "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174714844 )

Christina Ricci and Hank Azaria attend "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images) ( 174709803 )

Hank Azaria Hank, Hal Azaria and Katie Wright attend "The Smurfs 2" New York Blue Carpet Screening at Lighthouse International Theater on July 28, 2013 in New York City. (Photo by Craig Barritt/Getty Images ( 174717681 )

Actors Jayma Mays (R) and Adam Campbell attend the Los Angeles premiere of "The Smurfs 2" at Regency Village Theatre on July 28, 2013 in Westwood, California. (Photo by Michael Buckner/Getty Images for SONY) ( 174721719 )

Cast members (R-L) Katy Perry, Neil Patrick Harris, Jayma Mays and George Lopez pose at the premiere of "The Smurfs 2" at the Regency Village theatre in Los Angeles, California July 28, 2013. The movie opens in the U.S. on July 31. REUTERS/Mario Anzuoni ( USA/ )