The Hills Mischa Barton from 'The O.C.' joining MTV's 'The Hills: New Beginnings' revival of 'The Hills' 10/04/2018 The Hills: New Beginnings has added former The O.C. star, Mischa Barton, to its cast mix of original stars and fresh faces. Read More RELATED NEWS Mischa Barton from 'The O.C.' joining MTV's 'The Hills: New Beginnings' revival of 'The Hills'Audrina Patridge confirms she's split from Ryan CabreraWhitney Port confirms she'll be part of MTV's 'The Hills' revival TAGS: Dancing with the Stars Laguna Beach Kristin Cavallari Lauren Conrad Brody Jenner Audrina Patridge Mischa Barton Whitney Port Natasha Bedingfield The O.C.