The Hills Report: 'The Hills' star Kristin Cavallari was spotted doing cocaine 05/03/2010 Kristin Cavallari's The Hills co-stars are reportedly right in worrying about her alleged drug use. 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 Jason Statham
