The couple made their relationship official back in December, posting a cuddly photo to Instagram. Both had recently gotten out of high-profile relationships, with the One Direction alum ending things with his fiancee, Little Mix's Perrie Edwards, in August, and the model calling it quits with Joe Jonas in November.
A rep for Zayn had no comment about the breakup reports, while a rep for Hadid hadn't responded to Billboard's request for comment at press time.
See photos of Gigi Hadid and Zayn Malik together throughout their relationship:
The couple's last big public appearance together was at last month's Met Gala, where they wore matching armored outfits. During a May 16 visit to The Tonight Show Starring Jimmy Fallon, Hadid told a story about how Zayn helped her win big at the poker table in Las Vegas.
Within the hour after the breakup reports surfaced, Hadid posted a selfie with Kendall Jenner on Instagram. So far, Zayn has stayed off social media.