Jennifer Aniston mouths off with Jimmy Fallon

Just another reason why we love Jennifer Aniston.

The Cake star stopped by The Tonight Show starring Jimmy Fallon on Wednesday where she played a game of 'Lip Flip' with the chat show host.

The pair took turns swapping lips and speaking for one another and the result was simply brillant.

Jen (via Jimmy) revealed her best Billy Bob Thornton impression - who appartenly can't wait to go to the music festival and have a famous american grilled cheese sandwich.

And Jimmy (as Jen) appears as a “pretty pretty, pretty” Southern girl, that’s prone to hairballs.

The segment then turned into an amusing Super Bowl debate although we are not up-to-date with all the lingo.

Watch the game here in full:

Is there an app for this? We wanna play!