Britney Spears has two sons -- Jayden and Sean -- with ex-husband Kevin Federline, whom she was married to from 2004 to 2007.

The singer included her boys in the music video for Ooh La La from the Smurfs 2 soundtrack, which premiered in June. She phoned in to On Air with Ryan Seacrest and told the radio host her children was the reason why she chose to record the song for the animated movie.

"The main reason why I did it was because my boys," she said. "They're obsessed with the Smurfs. We've seen The Smurfs movie a million trillion times, and they were told they could be in the video and all this cool stuff, so that's the reason why I did it."

Britney Spears PHOTOS, 'Ooh La La' Singer Then & Now

Spears and her boys will be living in Las Vegas' Planet Hollywood Resort & Casino for the next two years as the singer starts her residency show there, which kicks off Dec. 27. Britney Spears: Piece of Me is slated for a two-year running with the possibility of an extension, according to Planet Hollywood.

Spears will perform 50 shows each in 2014 and 2015 with old music as well as new songs. TMZ leaked that the Work B--ch singer will earn $30 million over the two-year contract. She is also expected to release a new album at the start of her residency.

Spears took her sons with her on her Circus tour back in 2009. Her ex-husband, Federline did not approve with her taking the boys on the road, but he settled it after getting $5, 000 a week, according to the gossip website.

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