Wearing a gingham one-piece swimsuit, model Gigi Hadid followed boyfriend Zayn Malik as he climbed a rocky, beachside cliff in Malibu for the occasion of her birthday weekend. Ahead of the couple was the birthday girl’s little sister, model Bella Hadid, wearing a black one-piece suit and matching shorts. From each of their respective Instagram feeds, it appeared that both Gigi Hadid and Zayn Malik’s clans were all together to celebrate the model’s 21st birthday in Malibu this weekend.