EXCLUSIVE: Justin Theroux on Why He and Jennifer Aniston Are So Good Together: ‘We Get Along’

Since tying the knot in August 2015 after four years of dating, Jennifer Aniston and Justin Theroux are one of the sweetest celeb couples in Hollywood, and Theroux knows exactly why their relationship works.

“We appreciate each other’s sense of humor, we respect one another and we get along,” the 45-year-old actor told ET’s Nischelle Turner while promotinghis upcoming drama, The Girl on the Train. “I know it sounds simple but it’s true!”

WATCH: Justin Theroux on Married Life With Jennifer Aniston: ‘It Does Feel Different’

Theroux isn’t the only one making his marriage work in a big way — his Girl on the Train co-star, Emily Blunt, has been happily married to 13 Hours star John Krasinski for over six years and the two recently welcomed their second child in June.

According to Theroux, while Blunt was keeping her pregnancy hush-hush during production, she couldn’t keep it a secret from him.

Theroux recalled that his suspicion was first aroused when Blunt refused to perform a very simple stunt that required her to jump up from the floor and run a few feet across the room.

WATCH: Emily Blunt Glows on the Set of ‘Girl on the Train’ Following Pregnancy Announcement

“She was like, ‘Yeah, I don’t think I’d be sitting on the floor. I think I’d be leaning against the counter,'” he remembered. “We were like, ‘No, it makes total sense for you to be sitting on the floor. And then you just get up and run.’ She was like, ‘Nah, I’m not gonna do that. I’m gonna twist my hip or something.'”

Theroux said he told her he didn’t understand how she was “throwing Tom Cruise across the room [in Edge of Tomorrow] and going toe-to-toe with Benicio Del Toro [in Sicario]” but she wouldn’t do this simple stunt.

WATCH: Emily Blunt Was ‘Wracked With Terror’ Over ‘The Girl on the Train,’ But in a Good Way

“Later that day, we went back to my place and she was not having a cocktail and I asked, ‘Are you pregnant?’ And she was like, ‘Shhh!!’ And we had a big hug over that,” he recounted. “It was a little secret we had to keep for a while until it became obvious.”

For more on Emily Blunt’s acclaimed turn in The Girl on the Train, which pulls into theaters Oct. 7, check out the video below.

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