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OTRC: Britney Spears brings sons to 'Smurfs 2' premiere, NPH brings twins

Britney Spears and sons Sean Preston, 7, and Jayden James, 6, attend the premiere of 'The Smurfs 2' at the Regency Village Theatre in Westwood, near Los Angeles, on July 28, 2013. She contributed the track 'Ooh La La' to the film's sountrack and the boys appear in its music video. (Lionel Hahn / Abacausa / startraksphoto.com)

Britney Spears and sons Sean Preston, 7, and Jayden James, 6 attended the premiere of "The Smurfs 2" near Los Angeles over the weekend -- and she wasn't the only star to bring the kiddies.

Neil Patrick Harris, who provides the voice of Patrick in the film, and partner David Burtka also arrived with their 2-year-old twins, Harper and Gideon, while Larry Birkhead brought 6-year-old Dannielynn, his daughter with late model Anna Nicole Smith.

Spears' contributed the song "Ooh La La" to the movie's soundtrack and appears with her sons in the music video, which was released earlier this month (watch it below.)

Katy Perry, who provides the voice of Smurfette in the movie, also attended the premiere. She brought along her grandmother, Ann Hudson.

Check out more PHOTOS of Britney Spears and her sons, Neil Patrick Harris and his twins, Larry Birkhead and Dannielynn, Katy Perry and her grandmother and other stars at the premiere of "The Smurfs 2."

"The Smurfs 2" is set for release on July 31. Watch the trailer and Britney Spears' "Ooh La La" music video below.

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