Emily Blunt went to a ''sex club'' with Tom Cruise.

The 'Edge of Tomorrow' stars celebrated their fellow actor Matt Damon's birthday while filming for the sci-fi film in London and Emily's husband John Krazinski decided to cancel their plans for a ''civilised dinner'' in favour of a night at the city's notorious nightspot The Box.

Speaking to Jimmy Kimmel, she said: ''It was Matt Damon's birthday and my husband wanted to do something crazy for him.

''I don't know if you've heard of this club called The Box? It's kind of a burlesque stroke sex club. There's weird things going on that are meant to make you cringe.

''Tom loves Matt, and wanted to come. He thought it was going to be a nice, civilised dinner. So I emailed him and was like, 'Tom, change of plan. We're now gonna go to this club called The Box. Just wanted you to know, you may not be comfortable with this. It's kind of like a sex club.' ''

The 'Mission: Impossible' actor surprised his co-star, however, by messaging back to say he'd be happy to join them at the club.

Emily added: ''He emailed back and went 'Jesus Christ! Well just don't let me walk out of there alone!' which we didn't.''