United Kingdom, Sept. 22 -- Zayn Malik and Gigi Hadid's daughter Khai has celebrated her 6th birthday with a cute Squishmallows-themed party.

The former One Direction star took to Instagram to share pictures of the celebrations, while also posting a sweet tribute to his little girl.

He wrote alongside the gallery of pictures: "Khai's 6th birthday this weekend!! Big thank you to everyone who made it extra special."

He also shouted out the American Dream venue, particularly the Nickelodeon Universe and Hasbro Arcade, saying that Khai and her friends "had the BEST time".

Zayn also praised The London Baker, aka Elizabeth Rowe, who won the second season of Netflix show Is It Cake?, for putting together the incredible four-tier Squishmallow...