'I was being wussy!' Emily Blunt reveals Justin Theroux guessed she was pregnant when they filmed Girl on the Train

It was a secret she thought she had hidden well.

But Emily Blunt has revealed her Girl On the Train star Justin Theroux easily guessed she was pregnant when they worked together. 

'I was being really wussy with the stunts,' she said on the Today show. 'And I said, "I don't know if I should stand up too quickly, because my hip, I might just tweak something.'"

'I was being wussy!' Emily Blunt reveals Justin Theroux guessed she was pregnant when they filmed Girl on the Train

'I was being wussy!' Emily Blunt reveals Justin Theroux guessed she was pregnant when they filmed Girl on the Train

Guessed: Justin Theroux with Emily Blunt in Girl on the Train

Guessed: Justin Theroux with Emily Blunt in Girl on the Train

'He's like, "You did Edge of Tomorrow, are you pregnant?"' she recalled.

The film is based on the best-selling novel, and Emily plays alcoholic Rachel Watson.

'Poor, sweet Violet rattling around in there while I played this alcoholic,' she joked of her now three-month-old daughter.

Stylish: Emily wore a white batwing dress for her appearance on the Today show

Stylish: Emily wore a white batwing dress for her appearance on the Today show

Mother-of-two: She has a three-month-old daughter, Violet, and two-year-old Hazel

Mother-of-two: She has a three-month-old daughter, Violet, and two-year-old Hazel

But on a more serious note, she said acting while pregnant was not easy. 

'It wasn't easy playing both roles at the same time. I think I was really tired, so I became the queen of power naps.

'They'd be like, "Emily, you've got ten minutes," and I was like ... out cold somewhere in the corner.'

Emily wore a white batwing dress for her appearance on the Today show.

Along with Violet, she also has a two-year-old daughter, Hazel. 

Getting primped: Emily has her make-up done before the show airs

Getting primped: Emily has her make-up done before the show airs

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