Is Britney Spears Miming In Her Carpool Karaoke Sneak Peek?

James Corden has released a teaser clip of his forthcoming Carpool Karaoke with Britney Spears.

And while the clip only shows 58 seconds of the main video – which will be released in full on Thursday (Aug 25) – fans have accused the pop star of miming along to her hit track Toxic.

Copyright [CBS]

In the teaser, The Late Late Show’s host Corden, 38, enthusiastically belts out the lyrics to the 2003 dance song, but Spears, 34, appears to be moving her lips without actually singing (or she’s just very, very quiet).

“I like Britney… but the face that in this clip she’s not even singing out loud is making me cringe,” one person wrote on YouTube.

“Britney will be the first human being to make a Karaoke lip-sync. Queen,” another viewer commented.

This isn’t the first time the Baby One More time songstress has been called out for lip syncing, but usually she can be forgiven because she’s performing an energetic dance routine.

Copyright [CBS]

However less cynical fans remained hopeful, believing that the short video wasn’t representative of the whole karaoke session.

One fan wrote: “I feel like this is all a ploy to get people to watch, thinking she won’t sing live, and then she will!”

“Most of these Carpool Karaokes are at least 10 minutes long and you are going to assume that Britney is lip syncing or mouthing along to the entire thing based on 15 seconds of a clip. At least wait until Thursday and then pass judgments (sic),” another wrote.

Perhaps this is just part of her vocal warm-up? Whatever the case, we’ll soon be finding out as the full segment is released tomorrow (Aug 25).