The pair have welcomed a daughter, Malik announced on his social media accounts.
"Our baby girl is here, healthy & beautiful," he wrote. "(T)o 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"
Malik, 27, is a former member of the boy band One Direction.
Hadid, 25, confirmed she was pregnant with her first child in April.
"Grateful to know her, proud to call her mine, & thankful for the life we will have together," Malik added.
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