John Stamos welcomes his very first child: 'Not just an uncle anymore!'

All that practice as Uncle Jesse is about to pay off -- John Stamos is officially a dad!

The "Fuller House" star and his wife, Caitlin, just welcomed their newborn son, Billy, named after John's late father. A black-and-white photo shows the little one snuggled up on his dad's chest.

"From now on, the best part of me will always be my wife and my son," John wrote on Instagram, adding that he's "overjoyed." "Welcome Billy Stamos (named after my father)."

See the sweet photo of John and his newborn son:

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Celebrity Pregnancies and Babies of 2018
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Celebrity Pregnancies and Babies of 2018
From now on, the best part of me will always be my wife and my son. Welcome Billy Stamos (named after my father)  #NotJustanUncleAnymore #Overjoyed
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Nate Berkus became dad to Oskar, his second child with Jeremiah Brent.
Joy-Anna Duggar and husband Austin Forsyth welcomed Gideon Martyn Forsyth in February 2018.
Robin Thicke and April Love Geary had their daughter in February 2018.
Kim Kardashian and Kanye West had their third little one, born in January 2018, via surrogate.
Rachel McAdams and Jamie Linden had their first baby in April 2018.
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He also noted via hashtag, "Not just an uncle anymore."

An emotional and ecstatic John wed Caitlin in February, just a few months after they'd revealed the exciting pregnancy news.

"I've waited my whole life for this," Stamos told Entertainment Tonight of finding the girl of his dreams and starting a family.

See photos of John Stamos and wife Caitlin:

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John Stamos and Catilin McHugh together
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John Stamos and Catilin McHugh together
SAN DIEGO, CA - JULY 22: Caitlin McHugh and John Stamos attend the Comic-Con International 2016 - 20th Century Fox Party at Andaz Hotel on July 22, 2016 in San Diego, California. (Photo by Todd Williamson/Getty Images)
SAN DIEGO, CA - JULY 22: Caitlin McHugh, John Stamos, Darren Criss and Mia Swier attend the Comic-Con International 2016 - 20th Century Fox Party at Andaz Hotel on July 22, 2016 in San Diego, California. (Photo by Todd Williamson/Getty Images)
DANA POINT, CA - NOVEMBER 05: (L-R) Bob Rehling, Janeen Stamos Rehling, Alaina Stamos Talarico, John Stamos, Caitlin McHugh and Frank Talarico attend the Goodwill of Orange County Gala at Ritz-Carlton Laguna Nigel on November 5, 2016 in Dana Point, California. (Photo by Tara Ziemba/Getty Images)
BEVERLY HILLS, CA - NOVEMBER 14: Actors Caitlin McHugh (L) and John Stamos attend Saban Community Clinic's 40th Annual Dinner Gala at The Beverly Hilton Hotel on November 14, 2016 in Beverly Hills, California. (Photo by Rodin Eckenroth/Getty Images)
BEVERLY HILLS, CA - NOVEMBER 14: Netflix Chief Content Officer Ted Sarandos, Actress Caitlin McHugh and Actor John Stamos arrive for the Saban Community Clinic's 40th Annual Dinner Gala at The Beverly Hilton Hotel on November 14, 2016 in Beverly Hills, California. (Photo by Greg Doherty/Getty Images)
LOS ANGELES, CA - DECEMBER 07: John Stamos is seen with his girlfriend Caitlin McHugh on December 07, 2016 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 11: Actor John Stamos (L) and Caitlin McHugh at Nickelodeon's 2017 Kids' Choice Awards at USC Galen Center on March 11, 2017 in Los Angeles, California. (Photo by Chris Polk/KCA2017/Getty Images for Nickelodeon)
LOS ANGELES, CA - MARCH 11: Actors John Stamos (R) and Caitlin McHugh arrive at the Nickelodeon's 2017 Kids' Choice Awards at USC Galen Center on March 11, 2017 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
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John, 54, has openly talked about the bittersweetness of becoming a father without the presence of his own parents. “I will certainly fall short of the father my pop was, but – I’m going to give it my all," he wrote late last year.

“You know how you put your father on a pedestal, and he’s a superhero, and then as you grow older, you go, ‘Ah, he’s just a man’? I never got to that point," John has told People. "Till the day he died, he was bigger than life to me."

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