Watch celebs impersonate other celebs on 'Graham Norton Show'

If you thought Ariana Grande’s celebrity impressions were funny, wait until you watch Graham Norton’s compilation of celebrities impersonating other celebrities in these hilarious clips.

We recommend you watch the entire video so you don’t miss Jim Carrey bark like a St. Bernard and Ryan Reynolds give us a taste of his old-school, Canadian vocabulary.

The best accent was hands-down given to Chris Pratt for his impression of 'Towie,' a scripted-reality series.