After playing TV's beloved Uncle Jesse (and eventual father to twins Nicky and Alex) on Full House, John Stamos became a proud papa in real life after his son Billy was born. "From now on, the best part of me will always be my wife and my son," Stamos captioned a black-and-white photo of Billy snoozing on his bare chest via Instagram in April 2018. "Welcome Billy Stamos (named after my father). #NotJustanUncleAnymore #Overjoyed." Stamos shares Billy with wife Caitlin McHugh, whom he tied the knot with in February 2018.