Olivia Wilde and Jason Sudeikis have yet to tie the knot, but the couple are certainly living like they're already married. They have a son together and live together. Watch what Wilde says of their life together.

Olivia Wilden Opens Up On What It's Like Being A New Mom With Jason Sudeikis

On Thursday, Wilde appeared on The Today Show and opened up about life as a new mom and what it's like being with fiancé Sudeikis.

In her interview on the show, she was asked what her role in a horror movie was like when she was eight months pregnant.

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"If you look really closely you might be able to tell I'm like a little puffier," Wilde, 30, said of doing re-shoots for the film. "But it was really funny because the image of me with the lenses and the death makeup with this giant belly. It was like a whole different horror movie," she said.

She told Lucky that she was overall fuller, especially in her chest area, reported Us Weekly: "I'm like, double D, hello! I've never been in this section of the bra store! I've been flat-chested my whole life, so it's a wonderful new world," she said.

As for what it's like with fiancé Sudeikis and son, Otis, she says their focus is completely on their 10-month-old son.

"He's about to walk," she said. "He's teetering and I just don't want him to do it while I'm at work."

She also said that Otis is discovering some new hobbies at his young age.

"He's so smart and just plays his piano all day long. He's really musical so we're trying to encourage that," Wilde said.

Wilde is playing a woman brought back form the dead in the new film, The Lazarus Effect.