Pop princess Britney Spears has revealed that her sons Sean Preston, 3, and Jayden James, 2, have started to pick up swear words.

Spears, 26, who is very proud of her sons, says that she never uses swear words in front of her kids.

“They're starting to learn words like ‘stupid,’ and Preston says the F-word now sometimes,” Us magazine quoted her as telling Rolling Stone journal.

“He doesn't get it from us. He must get it from his daddy (Kevin Federline). I say it, but not around my kids,” she stated.

The Toxic singer is a doting mum, who loves her sons and sees them as twins.

“I think about how they're such special people,” she said.

“They both take care of each other. I think they look like me,” she added.