The Love Me Harder hitmaker, 25, and Hadid, 18, have reportedly been dating since May (15), but they haven't gone public with their relationship until now - on Tuesday the two were photographed walking to the Up and Down nightclub hand-in-hand.

Earlier this summer, the pair was reportedly spotted flirting at the Coachella Music Festival in Southern California, and last month (Aug15), they arrived separately to hotspot The Nice Guy in Los Angeles to meet up with Hadid's sister Gigi and her boyfriend Joe Jonas.

Hadid is the daughter of model-turned-reality TV star Yolanda Foster and the stepdaughter of legendary record producer David Foster.