Gigi Hadid wished "Zaddy" Zayn Malik happy birthday with a cheeky post on Instagram.
Supermodel Hadid and former One Direction star Malik welcomed their first child together - a daughter - in September.
She celebrated Malik's 28th birthday by thanking him for making her a mother to "the best girl ever".
Alongside a picture of her with the pop star, Hadid, 25, wrote:
On her Instagram Story, Hadid shared pictures from the birthday party, revealing she and Malik celebrated with retro arcade machines.
They also had small badges of Malik's face for his "Z-Day".
The couple are yet to reveal their daughter's name and have been careful not to show her face in pictures they have shared.
Malik is about to release his third solo album,, this week.
Hadid and Malik have been dating on and off since late 2015.