British actress Emily Blunt took her Edge Of Tomorrow co-star Tom Cruise to a sex club to celebrate Matt Damon's birthday party in London.

Blunt's husband John Krasinski was put in charge of planning the birthday bash and when Cruise asked if he could come along, the actress was happy to include him.

But then the plans changed and the party was relocated to one of London's most saucy addresses.

She says, "John, my husband, wanted to do something crazy for him (Damon). I don't know if you've heard of this club called The Box? It's kind of a burlesque sex club. There's weird things that go on and make you cringe.

"Tom loves Matt, and Tom 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'.

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