We have a new celebrity feud on our hands, people, and it's a juicy one: Cara Delevingne, who's close to fellow supermodel Hailey Bieber, called out Justin Bieber on Instagram on Friday after Bieber ranked Delevingne last out of three of his wife's supermodel friends—Kendall Jenner, Gigi Hadid, and Delevingne—on a The Late Late Show segment with James Corden.