A source tells ET that the couple recently found out the sex of their baby and are "over the moon" to be welcoming a baby girl to their family.
"At the end of the day it didn’t matter to the couple what the sex was, but now they can prepare for the new addition before she arrives," the source adds. TMZ was first to report the news.
A source told ET on Tuesday that Hadid is 20 weeks pregnant. The news broke just after the couple celebrated Hadid's 25th birthday while quarantining together with her family. Fans were quick to note the blue and pink strings on Hadid's birthday balloons, leading to speculation that the festivities may have doubled as a gender reveal party.
"Gigi and Zayn are expecting their first child together and the couple is very excited!" ET's source said. "Gigi has kept the secret close to her family and friends for a while, as she’s only a few months along. Once Gigi and Zayn got back together at the end of last year, it was like they never skipped a beat and knew what they had was special. The couple and their families are overjoyed."
In an interview with Al Jadeed TV via Instagram Live on Wednesday, Hadid's father, Mohamed Hadid, said he hadn't spoken to his daughter since the news broke, but said he'd be "very happy" if her happy news were true.
“Let me digest it and talk to her first, ‘cause I’m not sure if it’s real or not,” he said. “If she is, I’ll be very happy just as long as the baby is healthy and she’s healthy. That’s all I care [about]. I’ll be very proud of her if she has one.”
Malik and Hadid first started dating in November 2015. They split in March 2018, but soon after rekindled their romance. By January 2019, however, they had broken up again, but got back together late last year, ahead of the holidays. Hadid confirmed they were an item once again on Feb. 14, as she called Malik her "Valentine" in an Instagram post.
See more on the couple's forthcoming bundle of joy in the video below.