Watch Britney Spears join James Corden for Carpool Karaoke

What is the song "Oops!.... I Did It Again" really about? James Corden asked Britney Spears in Corden's latest Late Late Show "Carpool Karaoke" video. "I don't know," she said. "I really don't know. I think it's just a song." Corden said he thinks about the lyrics every time he orders a pizza from Dominos, and then they sang. Corden also peppered Spears with questions, and she dished. She wants three more kids, on top of her two virtual twins, 9 and 10, she said — "I have to find the right guy first" — though before you get excited, guys, she followed that up by saying she's "just done with men" and won't get married again. ("I don't believe in marriage anymore.")

If you watch, you'll learn that Spears' kids have seen her Vegas show, racy outfits and all — "I feel like they know that's mommy performing" — and that Corden is still scarred by a youthful look at his mother in her underwear. Spears was a good student who was paddled only once, and in between talking, she and Corden sang various Spears songs, like "Womanizer" and "Toxic." Corden is the more enthusiastic singer/dancer in his car, at least until they finally got to "...Baby One More Time" — though you may not be able to un-see James Corden in a sexy schoolgirl outfit. You've been warned. Peter Weber

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