Britney Spears and James Corden Sing ‘Toxic’ In Carpool Karaoke Preview

The biggest question fans had about Britney Spears' upcoming stint in the passenger seat of James Corden's "Carpool Karaoke" was whether or not she'd actually sing.

Now, in a snippet released leading up to tomorrow night's segment, it's still hard to tell what she's going to do in the end. While Corden has no problem singing along to "Toxic," Spears very visibly mouths along to the lyrics--we're hoping it's just first song jitters.

But, Brit, if you aren't going to sing, which, who knows the last time you really did, at least give us the charisma and hair flipping that makes your show so exciting to watch.

Britney Spears new album, Glory, releases August 26.