Mary-Kate and Ashley Olsen were just the cutest Mouseketeers ever! In anticipation of Disneyland reopening on April 30 in Anaheim, California, John Stamos shared a throwback photo of himself and his twin co-stars posing with Minnie Mouse when they were just little girls."#TBT In honor of @disneyland opening soon!" Stamos captioned the adorable photo.This is the second time this month that the 57-year-old actor has shared a throwback photo of the Olsen sisters.