Olivia Wilde and Jason Sudeikis have welcomed their first child, a baby boy.

The actors named their firstborn son Otis Alexander.

The couple's representative confirmed to People that Otis was born on Sunday, April 20.

Wilde announced the happy news via Twitter on Wednesday (April 23), writing: "Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I'm the building)."

She also posted a black-and-white photo which showed a close up of her cuddling her son.

Wilde and former Saturday Night Live star Sudeikis first started dating in November 2011 and became engaged in January 2013.