( 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 ca n'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 .
NEW : Rep : Wilde and former CNN star Wilde baby was born Wednesday . `` ` Saturday Night Live '' has LEFT the building ! ( I 'm the building ) , '' Wilde tweets . The 30-year-old actress tweets a photo of herself and the baby .