Bella is actually the younger sister of Taylor Swift BFF Gigi Hadid who is following in her sister's model footsteps. They are also both the daughters of famed Dutch-born model Yolanda Foster who might be best known as one of the stars of the Real Housewives of Beverly Hills. You might also have seen Bella hitting nights out with best friend Kylie Jenner, whose 18th birthday party she just attended. While some may have seen Abel pop up on Bella's Instagram over the summer, last night's outing confirms that Bella is definitely the beauty behind the madness.