April 18, 2016 02:45 PM

Karwai Tang/PA Wire/AP

Olivia Wilde is pregnant!

The Vinyl star and her fiancé, actor Jason Sudeikis, are expecting their second child, she announced Monday via Instagram.

“Matching baby bumps,” Wilde captioned a photo of herself with son Otis Alexander, who turns 2 this week.

Their rep confirms the happy news to PEOPLE.

Earlier this month, Wilde told PEOPLE that she and the Mother’s Day star, 40, are ready to give little Otis a sibling.

“I’m desperate for more [kids]!” Wilde, 32, said at a Marimekko for Target event in New York. “I love my siblings so much and Jason has incredible siblings too. The more the merrier.”

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She added that little Otis is in favor of becoming a big brother — sort of.

“[He] loves little babies,” Wilde said. “He has a Michael Jordan doll that he carries around sometimes. [He uses the doll] as either a hammer or a baby”

— Char Adams with reporting by Julie Jordan

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