She took in an afternoon helicopter ride with her sister and her mother, Yolanda Hadid...
...Before enjoying cake with her boyfriend, Zayn Malik.
She received lots of flowers from friends, including Karlie Kloss and Taylor Swift.
Then, later in the evening, she channelled her inner unicorn and swapped her low bun for a vibrant pink wig. She ditched the mum jeans for a pair of green velvet trousers, threw on some pink shades and voila!
22 is looking pretty darn great right about now. Happy birthday, Gigi!