Britney Spears sings one of her biggest hits with James Corden on Carpool Karaoke preview

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Watch Britney Spears sing along to 'Toxic' in Carpool Karaoke teaser!

Britney Spears is joining James Corden on Carpool Karaoke this week ... and viewers have been given a sneak peek at one of the songs they belt out together.

The American pop star and British funnyman sing her number one hit Toxic in a preview to Thursday's episode of The Late, Late Show.

Britney, 34, talks about her two sons in the clip as James quizzes her about whether they have seen her Las Vegas show.

"I saw my mum in her underwear once when I was like 11," he reveals, before Britney interrupts by saying: "You're so dirty."

Britney Spears on stage
Britney Spears on stage (Chris Pizzello/AP)

James replies: "I'm saying it's not dirty, I can't shake the image from my brain."

It remains to be seen whether Britney can surpass the reigning Queen of Carpool Karaoke, Adele, whose appearance has attracted 123 million views on YouTube.