The new couple, who've been dubbed G.I. Joe, strolled hand-in-hand through the park and took a spin on a few rides, including the terrifying water plunge ride Splash Mountain.
The supermodel, 20, dressed in theme for the outing, wearing a white Mickey Mouse t-shirt and a pair of furry Minnie Mouse ears.
Jonas, 25, and Hadid were joined by several other friends as they hit up rides like Pirates of the Caribbean, the Haunted Mansion and the Jungle Cruise.
"I'll be your Minnie," she wrote, adding a winky face.
In another image, the model smiles with a friend in a black and white polaroid.
"Disney days, bestie days," she wrote.
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Hadid and Jonas were first spotted together earlier this summer, and haven't been shy about showing off their budding romance. They've been spotted hanging with their famous pals (including Taylor Swift and Calvin Harris), and were even photographed kissing on the street.
The couple have even embraced their nickname, with Hadid wearing a shirt reading "G.I." as she walked next to the former Jonas Brothers singer.