Zayn Malik fans were left in disbelief as he shared a mega-rare update. The musician who rarely gives insights into his personal life took to social media to share a milestone with his followers. But while fans were left gushing over the update, some were shocked by it.

Zayn, 31, took to his Instagram page to post an adorable snap of himself and his daughter Khai, who he shares with his ex-girlfriend, Gigi Hadid . But fans couldn't believe it as Zayn revealed his daughter was celebrating her fourth birthday. Posing on a beach as they gazed out over the horizon, Khai wrapped her arm around her famous dad who clung to her for the adorable snap.

Captioning his post, Bradford-born Malik stated that Khai was the "most important" person to him. He wrote: "Happy birthday to the most important person in my life, I love you more than words allow me to express, beyond proud to call you my daughter..

. Grateful for every second I get to spend next to you, as you become the incredible person I know you already are. Four years ago today my life changed forever and I wouldn't be the man I am today without you.

" His upload which over 1.9 million fans have liked was soon flooded with messages from his supporters. "Four? I just sleep for one night," said one who was in disbelief.

A second commented: "So proud of you. Khai is such a lucky kid to have a dad like you." "OMG she is so big Zayn," said a third.

Meanwhile, a fourth fan added: "Shut upppp this is so cute. Happy birthday Khai!" "The mo.