"The Tin Man, Dorothy and The Scarecrow say hi to the cutest of Munchkins. #BillyandtheRippers," Stamos captioned an Instagram photo that showed Billy, clad in a Jesse and the Rippers onesie, with actors Bob Saget and Lori Loughlin.
Billy, born April 10, is the first son of Stamos and wife Caitlin McHugh, People reported.
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