LOS ANGELES — Supermodel Gigi Hadid on Thursday confirmed she was expecting a baby with former One Direction singer Zayn Malik, saying the couple were both excited and happy.Hadid, who turned 25 last week, appeared remotely on Jimmy Fallon’s “Tonight Show” on Thursday to give the news following rumours circulating for several days in the celebrity media.“We wish we could have announced it on our own terms but we are very excited and happy and grateful for everyone’s well wishes,” said Hadid, according to an advance excerpt of the video.Hadid and British singer Malik started dating in late 2015 and their on-off romance made them one of the most sought-after celebrity couples.