EXCLUSIVE: Emily Blunt dishes on double dating with husband John Krasinski and pals Justin Theroux and Jennifer Aniston

They may play on-screen exes, but in real life, Emily Blunt and Justin Theroux are good pals. The Girl on the Train co-stars and their famous spouses – John Krasinski and Jennifer Aniston – have been known to hit the town together.

WATCH: Jennifer Aniston and Justin Theroux Have a Night in With Emily Blunt and John Krasinski

So what's a night out like for the A-list foursome?

"Food usually," Blunt told ET at the New York premiere of her new thriller. "I kind of like food. And I really like a nice, cold martini."

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As for what goes on behind closed doors when she's alone with Krasinski, she teased, "Why would I ever tell you the kind of sorted, dirty things that go on?" quickly adding, "No, nothing. It's quite boring."

The mother of two also revealed that her eldest daughter, Hazel, loves to watch her get ready for the red carpet.

"She looks a bit like surprised, like whoaaa, and gives me a look up and down," Blunt said. "It's a look she's not used to seeing."

WATCH: Emily Blunt Says 'Girl on the Train' Extras Thought It Was a 'Friends' Reunion

As for whether the couple's daughters, Hazel and Violet, will ever hit the red carpet with their actor parents – "Never," Blunt declared firmly.

For more on Blunt and Krasinski's double dates, watch the video below!

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