The Hills Kristin Cavallari says she gave 'The Hills' co-stars baby advice 07/06/2017 Kristin Cavallari says she's given baby advice to her former "The Hills" co-stars. Read More RELATED NEWS Kristin Cavallari debuts new 24-year-old boyfriend Mark EstesBrody Jenner and Tia Blanco welcome their first child'The Hills' alum Brody Jenner engaged to pregnant girlfriend Tiarah "Tia" Blanco TAGS: Kristin Cavallari Audrina Patridge Heidi Montag Jay Cutler Today