Saturday marks Gigi Hadid's 21st birthday, and the stunning supermodel [1] kicked things off by celebrating with her equally gorgeous family on Friday. Gigi took to Instagram to share photos of her low-key lunch with her younger siblings, Bella and Anwar Hadid, and half-sisters Marielle and Alana Hadid. "Birthday week begins," she wrote alongside a group shot. The model's boyfriend, Zayn Malik, isn't pictured, but judging by their recent Vogue photo shoot [2], which included a steamy makeout session [3], we're sure he has something very romantic planned.

Gigi's parents, Yolanda and Mohamed Hadid, also gave their daughter sweet shout-outs on social media. Yolanda called Gigi her "sweet angel," [4] while Mohamed described her [5] as "charming and bubbly, innocent and friendly." Keep reading to see more photos from her big weekend, and then check out her cutest BFF moments with Kendall Jenner [6].