ZAYN Malik and Gigi Hadid are having a baby together, according to explosive reports in the US.

The 25-year-old model is around 20 weeks pregnant with the 27-year-old former One Direction star's child, according to TMZ meaning she would be due to give birth in September.

4 Zayn Malik and Gigi Hadid are having a baby together according to reports Credit: Getty - Contributor

The pair have been isolating together at Gigi's family's Pennsylvania farm alongside her 23-year-old model sister Bella in recent weeks.

They posed together in a snap at the weekend as she celebrated her 25th birthday, with Zayn standing between the two sisters with his hand on Gigi’s waist in one snap.

The pair are thought to have rekindled their relationship in December after a break and were spotted together in New York in January, suggesting things were back on track.

Fashion-watchers have noticed her wearing increasingly loose clothing in public recently, where once she was keen to show off her figure.

4 Zayn and Gigi were seen together at the weekend as they celebrated her 25th birthday

4 The couple at a fashion event in Paris back in 2016 Credit: Rex Features

4 The pair first began dating in 2015 after meeting on his Pillow Talk video Credit: Instagram

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Zayn and Gigi first began dating in 2015 after meeting on the set of the video for his song Pillow Talk.

However, The Sun revealed that they had called it quits in March 2018 - but have clearly now rekindled things in a major way, according to a family source.

Despite the pair remaining silent on the reports, fans have begun bombarding the couple with well-wishes.

One excited follower was typical of many, writing: "CONGRATULATIONS🎉🎊 🌹" on one of the singer's posts.