Britney Spears Forgets to Sing With James Corden in Carpool Karaoke Teaser

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Perhaps mixing up her late-night hosts, Britney Spears appears to be Lip Sync Battling while James Corden croons in the teaser trailer for Thursday night's Carpool Karaoke. Although past notable passengers — including Lin-Manuel Miranda, Red Hot Chili Peppers, and Beyoncé-enthusiast Michelle Obama — were ready to commit with loud, passionate renditions of popular song for The Late Late Show segment, Britney mainly seems content to let Corden do the singing to "Toxic" while she mouths the words and provides the hand jives that only a true Las Vegas headliner would be able to master. Maybe Spears will gimme more, gimme, gimme more actual music during the full drive on Thursday.