Uncle Jesse junior.
Johns Stamos recently shared a series of photos to Instagram from a trip to NYC, which included several father-son snaps with his only child, Billy. In the first photo, the 4-year-old—who he shares with wife Caitlin McHugh—looks more grown up than ever, as he posed alongside his dad while bundled up in a plaid puffer coat, with his wavy light brown hair under a sage green knit beanie.
In another pic, Billy rocks a handsome red velvet suit while on stage with John at the legendary Carnegie Hall where the Full House alum performed as part of the 2022 holiday tour dubbed "Tis the Season with The Beach Boys featuring The Holiday Vibrations Orchestra" on Dec. 5.
John captioned the Dec. 12 post, "NYCdump pt. 1."
In the comments, fans were quick to gush over Billy, with one writing, "What a sweet boy, a total daddy look a like," while another wrote, "Beautiful boy. He has your hair."
John and Caitlin welcomed their baby boy—named after the actor's late father—in April 2018, two months after their wedding. "From now on the best part of me will always be my wife and my son," John wrote on Instagram when introducing his baby boy to the world, also adding the hashtags "#notjustanuncleanymore #overjoyed."
Despite their online attention, John recently joked that Billy "hasn't really" fully grasped how "cool" his dad is. However, the 59-year-old said that he and Caitlin, 36, have made a point in keeping their son grounded.
"I just have to lay the foundation of being loving and kind, and teach him to be that," John told E! News in October. "I think we're pretty good examples, my wife and I."
He continued, "The hard thing is he lives a pretty privileged life. [My wife's] great, she takes him down to feed the homeless in Orange County and we take him on stuff like that. We try to show him it's about service and giving back."
Keep scrolling to see more pictures of John's family album...
John and Billy appear in a video the actor posted on his 60th birthday.
John Stamos and Caitlin McHugh brought their son Billy Stamos to Disney Junior's "Glow Webs Glow" event celebrating the second season of Marvel's Spidey and His Amazing Friends in August 2022.
The duo rocked serious looks during their trip to NYC in December 2022.
"UFO welcoming committee," Stamos captioned a photo of him and Billy posing with Iron Man in July.
Billy paid Stamos a visit on the set of his Disney+ series Big Shot.
The father-son pair snuggled at cruising altitude in this pic that was shared in mid-July.
Stamos and McHugh hold Billy and celebrate the Fourth of July.
The actor posts a photo of himself gardening with Billy.
The People's Choice Awards winner starts off 2019 by posting this precious father-son photo to Instagram.
The Stamos trio donned matching outfits and Santa hats in this adorable pic that's perfect for their 2018 Christmas card.
"Already my favorite Christmas," Stamos captioned a photo of him and his son spending the holiday season at Disney.
While Billy may be too young to vote, the Grandfathered actor encouraged everyone to get out and vote during the 2018 midterms.
In October 2018, the California native took a dip with his son in the pool.
The ER alum is caught leaning over to give his son a kiss on Billy's first Fourth of July.
McHugh snapped this adorable pic of her husband and son on her birthday writing, "I'm the luckiest birthday girl in the world to spend today with you two."
Stamos went from everyone's favorite fictional uncle to real-life dad in April 2018 when his and wife Caitlin McHugh's son Billy was born. The sitcom star introduced little Billy to his Full House co-stars Bob Saget and Lori Laughlin.