Gigi Hadid is commemorating her daughter's milestone birthday.

The supermodel shared some sweet messages for Khai —who she shares with ex Zayn Malik —as she turned five years old Sept. 19.

Gigi posted an adorable photo of her kneeling down in the dirt behind her daughter who was dressed like a cowgirl in a jean jacket, chaps and pink cowboy boots with her hair in braided pigtails. For her part, the 30-year-old was wearing blue jeans and a camo sweatshirt with cowboy boots.

"My girl is 5 today," she wrote over the photo on her Instagram Stories , which had Khai's face cropped out for privacy. "Happy Birthday to me greatest love & gift."

Gigi also shared a behind-the-scenes photo of her pregnant during a photoshoot and wrote "Khai Loading..." In a subsequent slide, the Gues

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