The pair stepped out on Thursday night to back Hadid's mother, Yolanda Foster, who was honoured for her Lyme disease advocacy work at the event, reported People magazine.
While Hadid, 20, made her way down the carpet, Jonas chatted up her step-father, composer David Foster, and younger brother Anwar, as well as giving her mother a big hug as soon as he saw her.
Since they began dating this summer, Jonas and Hadid have been spotted out and about, enjoying international group dates with A-list close friends and a cutesy couples date at Disneyland.