A post shared by John Stamos (@johnstamos) on

Jesse is no longer just an uncle!

Congrats to John Stamos, 54, and his new wife, Caitlin McHugh, 32, who welcomed their first child, a baby boy named Billy, late Sunday night with the sweetest Instagram post. The caption reads, “From now on, the best part of me will always be my wife and son. Welcome Billy Stamos (named after my father) #NotJustanUncleAnymore #Overjoyed.”

The couple announced they were expecting in December shortly after getting engaged at Disneyland in October, and tied the knot on February 3 of this year in a small ceremony in Studio City, California. 

Chances Billy’s first words will be “Have mercy”? We’re calling it now.

RELATED: Lori Loughlin Already Knows What Kind of Dad John Stamos Will Be

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