Zayn Malik and Gigi Hadid have announced the birth of their first child together - a baby girl.

The 27-year-old former One Direction singer posted a black-and-white picture of him holding his baby's hand to his Instagram account.

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"Our baby girl is here, healthy and beautiful," Malik captioned the picture.

"To try put into words how I am feeling right now would be an impossible task.

"The love I feel for this tiny human is beyond my understanding. Grateful to know her, proud to call her mine, & thankful for the life we will have together x."

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US model Hadid, 25, shared a similar black and white image to her account with the caption, "Our girl joined us earth-side this weekend and she’s already changed our world. So in love."

Hadid confirmed she was pregnant in April, telling chat show host Jimmy Fallon she and Malik were "happy and grateful for everyone's well wishes and support".

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The couple have dated on and off since late 2015.