Have mercy! John Stamos‘ son Billy, 3, is growing up so fast, and the 58-year-old Full House star can’t believe it!
John posted a slideshow of his only child through the years, as the little one prepares for his first day of school on Wednesday September 8.
John’s “mini-me” couldn’t look happier to start school, even if his dad got a little choked up at how quickly his son is growing up!
With the slideshow set to The Beach Boys’ classic tune “When I Grow Up (To Be A Man),” John shared photos of Billy from infancy to leaving for his first day of school.
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