Uncle Jesse is now a first-time dad.
John and Caitlin became engaged in October, with the 54-year-old actor sharing the news with a sweet drawing on Instagram of the couple standing in front of Cinderella's castle in Disneyland.
Accompanied was a black and white photo of the actor with the newborn. "Welcome Billy Stamos (named after my father)", so he wrote in the caption. He and model and actress Caitlin McHugh tied the knot in February of this year.
He captioned the post: "From now on, the best part of me will always be my wife and my son".
The baby boy was named Billy Stamos after the "Fuller House" star's late father.
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Stamos announced he was going to be a father back in December.
Lori Loughlin, who co-starred in Full House with Stamos as Rebecca, Uncle Jesse's wife, is also sure Stamos will be a great father. Candace Cameron Bure, Stamos' co-star from both Full and Fuller House (who has three kids of her own), wrote, "Yes Yes Yes!"
He previously said: "It's just taken me a lot longer than I anticipated". "Because you're old", McHugh joked. I have a youthful thing.
"We have the same morals and the same values, that all clicked nicely. So I called her parents to ask, and it was like, 'You better!'" "People would say, 'You should have a child.' I was like, 'That ship has sailed, '" he admitted at the time.