Britney Spears may need to break out a bar of soap.

In the Dec. 11 issue of Rolling Stone, she says her sons Sean Preston, 3, and Jayden James, 2, already have potty mouths.

“They’re staring to learn words like ‘stupid,’ and Preston says the F-word now sometimes,” Spears, 26, reveals.

“He doesn’t get it from us,” the singer stresses. “He must get it from his daddy [Kevin Federline]. I say it, but not around my kids.”

Every time she sees her boys, “I think about how they’re such special people.

Her boys “are almost like twins,” she continues. “They both take care of each other. I think they look like me.

As a mother of two, Spears — who currently has two visits and an overnight per week with her children — says she feels like “an old person now. I do! I go to bed at, like, 9:30 every night, and I don’t go out or anything.”

She also says her new album, Circus (out Dec. 2), offers some insight into her hectic, controlled world.

One unnamed cut is “about artistic expression and the masquerade of people acting and putting on shows,” she says.

“Through that, you create your own world. The song talks about how other people are coming into this girl’s world, but she didn’t invite them in,” Spears explains. “So she’s saying, ‘Why are you here, if I didn’t invite you?’

“It’s complicated,” she says, “but you can tell it’s me who wrote it, because it’s in my voice and there’s a difference.”

Though she penned the tune, Spears admits that “it’s scary to put yourself out there and be like, ‘Oh, God, is that cool?’

“If you’re not going to really go for it, you can’t just go there halfway,” Spears says. “But sometimes, when you go for it, you can’t lose.”

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