Jost announced the quality connected his Instagram Wednesdasy.
"Ok good we had a baby. His sanction is Cosmo. We emotion him precise much," Jost wrote.
No details arsenic to erstwhile the babe was calved were shared. He went connected to accidental "privacy would beryllium greatly appreciated."
This is the 2nd kid for Johansson, who has girl Rose Dorothy, 7, with her ex-husband Romain Dauriac.
The histrion and "SNL" prima got engaged successful 2019 and wed successful 2020.