The actor is having trouble accepting that his son is growing up!
John Stamos' son, Billy Stamos, is quickly growing up!
The 59-year-old actor shared a new photo of his son looking adorable and all grown up as he heads to his first day of school for the 2022-2023 academic year.
Posting the picture on Instagram, Stamos captioned the post: "One of us is starting his first day at school. And the other is doing everything in his power not to cry."
While he might be holding back tears in the picture, Stamos still looked great, wearing a white shirt that matches Billy's button-up and khaki shorts.
Billy stood behind his father holding a leaf and smiling, leaning on Stamos' shoulder.
Stamos' mini-me also takes after his father with his fantastic, long hair, that goes all the way down to his chin.
American-Irish actress Darcy Rose Byrne commented on the post, writing, "Aw! Happy first day!," while another actress, Parminder Nagra, simply commented, "Awwww 🙌."
Nicky Whelan, an Australian actress, commented three hands up emojis, while Cricket Wampler, who stars in the Stamos-led Disney+ series Big Shot, said, "they grow up so fast🥲🏼."
The years flash by, as it feels like only yesterday, Stamos wished his three-year-old son a good luck on his first day of school. In the old post, which consisted of a montage video of pictures of Billy over the years, the caption read, "First day of school. I’m not crying, you are."
Stamos welcomed Billy in 2018 with wife, Caitlin McHugh. They got married the same year, shortly after McHugh discovered she was pregnant.
He later returned for the sequel series, Fuller House, which also had a long run. Fuller House premiered in 20160-2020.