This is the couple's first new addition to their family.
There's not just a baby on the way for Scarlett Johansson and Colin Jost - it's already been born.
The news was confirmed by People earlier this morning that the 36-year-old had given birth to a new bundle of joy.
New dad Colin posted on his Instagram page that they had welcomed a baby boy, who they are calling Cosmo.
He wrote: "Ok ok we had a baby. His name is Cosmo. We love him very much. Privacy would be greatly appreciated."
He also used hashtags #wegotawaywithitforalongtime, #nokidspolicy, and
The couple definitely got away with it "for a long time". Earlier this week it was reported that Colin revealed their pregnancy news during a stand-up gig. Little did anyone know that they were due baby Cosmo quite imminently.
Scarlett Johansson has been out of the public eye for the majority of this year, even with her Marvel movie 'Black Widow' hitting cinemas and Disney+. Rumours began to circulate that the star could be pregnant due to her wishing to take part in TV and chat show interviews via Zoom rather than in person.
The baby news for Scarlett Johansson and Colin Jost comes less than a year after they got married in October 2020. Scarlett has a daughter, Rose, from her previous marriage to Romain Dauriac.