Hollywood star Scarlett Johansson and Colin Jost have welcomed their first baby together. Johansson's representative Marcel Pariseau confirmed to people.com. The "Black Widow" actress is also mom to daughter Rose Dorothy, who turns 7-years-old this year.

Jost briefly mentioned their pregnancy news during a stand-up performance at The Ridgefield Playhouse in Connecticut on Sunday, a source confirmed to people. On Instagram later Wednesday, Jost shared a statement revealing that they welcomed a baby boy named Cosmo. He wrote: "Ok Ok we had a baby. His name is Cosmo. We love him very much. Privacy would be greatly appreciated."