Turning 21 never looked so good! Gigi Hadid turned 21 Saturday and celebrated with her boyfriend, Zayn Malik, and best friends Taylor Swift and Calvin Harris. Gigi showcased her fun weekend on Snapchat, starting with a trip to Coachella on a private plane with Taylor and her boyfriend. Taylor, who is still killing it with her bleached blonde hair, surprised the model with a fab birthday cake, which they ate midflight.