I think what was the most challenging about it is to play someone like this in the first trimester.

We were rehearsing a scene… and she had a stunt I wouldnt evencallit a stunt, Theroux remembers.

I think Id be standing, and Id just bolt for the door.'

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Credit: RUVEN AFANADOR for EW

Blunt looked to Theroux for support, but he was puzzled by her choice.

I was like, Twist your hip?

This is the person who went toe-to-toe with Tom Cruise inEdge of Tomorrow!

Eventually, when Taylor left the room, Theroux asked her point-blank, Are you pregnant?

She said yes, and wondered how he knew.

Youre not 80 years old and you dont have arthritis.

So youre either pregnant, or youve gottenreallylazy.'

But knowing his friends happy news early did have its downsides.

Working with a pregnant person, thats a challenge, Theroux says.

All youre wanting to do is nurture them, and all your scenes with them are yelling at them!

You cant help but think at some point, maybe the babys hearing this?

When I finally meet her new child, well see how [she] reacts.

When she hears my voice and bursts into tears, well know I scarred the child prenatally.