Gigi Hadid has thanked Zayn Malik for "making [her] a mamma".

Zayn Malik and Gigi Hadid (c) Instagram

Zayn Malik and Gigi Hadid (c) Instagram

The 25-year-old model - who gave birth to the couple's daughter in September - shared a touching tribute to the 'Pillowtalk' hitmaker on his 28th birthday on Tuesday (12.01.21), nicknaming her partner "Zaddy baba".

Alongside a photo of the couple dressed up and a drawing of Zayn holding a baby, she wrote on Instagram: "Team No Sleep ! Happiest birthday to our Zaddy baba. So special. Love you long time, thank you for makin me a mamma to the best girl ever [smiling emoji] Wish you the best every single day.(sic)"

Gigi also shared photos from the former One Direction singer's celebrations on her Instagram Story, which included a number of arcade games, sweet treats in a retro gaming theme, dozens of balloons, and confetti and party hats adorned with Zayn's face.

Zayn's birthday came a day after the family celebrated Gigi's mother, Yolanda Hadid's big day on Monday (11.01.21).

Gigi wrote on Instagram earlier this week: "Celebrated mamma's bday tonight @yolanda.hadid.

"Every year, I think I couldn't love, look up to, or learn from her more—and then I do. She's the best mom and Oma we could ever ask for. So blessed. I LOVE YOU, THANK YOU FOR EVERYTHING. Wishing you the best year.(sic)"

Her mom replied: "I love you baby, thank you for a beautiful dinner at home."

Yolanda used her own account to reflect on her birthday and hailed her grandaughter as the biggest "blessing" in her life.

Originally sharing a photo of the tot's face, which she quickly removed and changed for a different photo of herself and the baby, she wrote: "My birthday blessings... When I woke up this morning and counted all my blessings in life this little Angel was ranked #1. It's a whole new feeling, I'm feeling..., a part of my heart I didn't know existed....(sic)"