A lot of celebrities are getting very apologetic but it’s all in the name of drama.

Stars including Mad Men actor Jon Hamm, John Legend, Kate Beckinsale, Ellen Page, Don Cheadle and Chloe Sevigny recited the catchy song in a hilarious montage video.

Vanity Fair made the video at this year’s Sundance Film Festival but it seems some of the stars were only learning the words for the first time in the video.

Jon Hamm kicks off the video with the first lines of the song but goes off-script when he says he’s sorry he doesn’t know the lyrics.

He asks: “Is it too late to say I’m sorry that I don’t know the song I’m Sorry by Justin Bieber?”

Justin will be performing at the Grammy Awards next week so maybe these famous Beliebers will get to hear the man himself perform the track.