Uncle Jesse Is a Dad! John Stamos Welcomes a Son

Uncle Jesse Is a Dad! John Stamos Welcomes a Son

Stamos writes, "From now on, the best part of me will be my wife and son".

The 54-year-old named Billy after his late father, Bill Stamos.

Accompanied was a black and white photo of the actor with the newborn.

The "Fuller House" star posted a throwback pic last month from his "Full House" days showing his character, Uncle Jesse, sporting a baby bump and a shirt which read "Bun in the Oven". "Can I come over tomorrow?"

Stamos announced he was going to be a father back in December.

This is John's second marriage - he was previously Wednesday to actress Rebecca Romijn from 1998 to 2005. The couple got married in Beverly Hills on February 3. "I've been practicing for a long time", Stamos told PEOPLE, referring to his TV roles. "Because you're old", McHugh joked.

He said: "She's so handsome pregnant". Stamos noted at the time that he thought he'd run out of time to be a parent. I have a youthful thing.

"From now on, the best part of me will always be you".

She described it as the look of a man who wanted to be a father his whole life but thought the moment had passed.

"I don't think John needs any parental advice".

"The look on John's face when I told him we were pregnant was priceless", smiled Caitlin. Every day I say, 'You're doing so great, you're doing so great'. "I have two girls who are 18 and 19 and he just adores them".