The pair made their first official red carpet appearance at the Global Lyme Alliance inaugural gala in New York last month, when Hadid's mom, The Real Housewives of Beverly Hills' Yolanda Foster, was honored for her advocacy work.
G.I Joe spent Halloween at separate parties - Hadid at Heidi Klum's annual bash in N.Y.C while Jonas hosted a Birchbox Man dinner for Movember in Los Angeles with brother Nick Jonas and bandmate Cole Whittle.
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Hadid, 20, made her directing debut on a video for Jonas' band DNCE's track Cake By the Ocean.
"She had a megaphone. She was a badass," Jonas, 26, told People.
"Everybody really looked up to her to lead and she really came through and showed us that she could do it."
Prior to hooking up with Jonas, Hadid was linked to Australian singer Cody Simpson, while Jonas was last heard to be dating another model, Blanda Eggenschwiler.
- nzherald.co.nz additional reporting People