Olivia Wilde and Jason Sudeikis attend the 2014 Vanity Fair Oscar Party on March 2 in West Hollywood, California.

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NEW: Rep: Olivia Wilde and former SNL star Jason Sudeikis' baby was born April 20

"Otis Alexander Sudeikis has LEFT the building! (I'm the building)," Wilde tweets

The 30-year-old actress tweets a photo of herself and the baby

CNN  — 

Actress Olivia Wilde proudly announced the birth of her baby boy on Wednesday, tweeting a photo to share the news with her fans.

“Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I’m the building),” she wrote.

The photo posted by the 30-year-old actress shows her smiling, with the baby’s head pressed against her cheek.

Wilde and former “Saturday Night Live” star Jason Sudeikis welcomed their newborn on April 20, a representative for Wilde said.

The couple announced their engagement last year and revealed in October that they were expecting their first child together.

“We’ve discussed all our ideals and hopes. I can’t wait for children,” the “Rush” star told Marie Claire last year. “I’m open-minded about how many, but three, which I love, is like a little party. … (T)here’s no strict plan for anything in my life. What happens, happens.”

But even then Wilde said she knew her husband-to-be would make a great dad.

“He’s so good with kids,” she told the magazine of Sudeikis, 38. “I’ve never before experienced looking at someone and thinking, ‘That’s who I want to raise a child with.’ “

CNN’s Breeanna Hare and Jane Caffrey contributed to this report.