Supermodel Gigi Hadid has praised her younger sister Bella as an "inspiration".
Gigi took to Instagram on Monday to celebrate her sister and fellow model hitting the milestone age of 21, and in a sweet tribute, she claimed she is "so so proud" of her "forever cool" sister.
Posting a throwback image of a young Gigi feeding Bella her bottle, she wrote: "Happy 21st birthday my angelic sister Bella Hadid! There are no words for how much I love you. You know I've been trying to protect you from the world since day one, and 21 years later you comfort and inspire me more than you'll ever know.
"You have always marched to your own drum, and you make me so so proud. You are loving, kind, driven, perseverant, and forever cool af. You have a power to empathize with everyone & love always, and you make so many people happy in doing so! So excited to celebrate tonight - Cheers to you Bella Kai Kai I love you my little sissy pop."
The post comes after Gigi took to the photo sharing website the day previous to remind her followers that her "forever bestie" would be turning 21 soon.