Gigi Hadid and Joe Jonas make their red carpet debut

Gigi Hadid and Joe Jonas are officially a capital-C Couple.

The pair have been rumored to be dating for a while, but made it red carpet-official (the celeb version of Facebook official, no?) on Thursday night at the Global Lyme Alliance Gala in New York, an event that held particular significance for the Hadids: Gigi's mother Yolanda Foster and siblings Bella and Anwar Hadid both have been diagnosed with the disease.

Bella Hadid battled lyme disease, reveals mom Yolanda Foster

It was an emotional night for Gigi, who shared her feelings about her family's struggles with ET. "I'm the only one in, of my siblings, my mom and my family that hasn't been affected by Lyme disease," she said. "It's been really hard for me because I'm the only one that doesn't really understand it."

Good for Joe for showing his support during such a meaningful night.