Have mercy — John Stamos is a dad.
The Fuller House star announced the news on Instagram, revealing he and wife Caitlin McHugh have welcomed a son.
“From now on, the best part of me will always be my wife and my son. Welcome Billy Stamos (named after my father),” Stamos captioned a photo of the newborn nestled on his chest. “#NotJustanUncleAnymore #Overjoyed”