Kristin Cavallari is grateful for her reality TV roots, but there are still some moments that make her cringe. The 34-year-old Uncommon James founder reflected on joining the cast of at the tender age of 17 while speaking exclusively with ET's Lauren Zima at the Dallas, Texas, location of her Uncommon James jewelry and beauty store. «Uncommon James probably wouldn't exist if it wasn't for my built-in audience from the TV shows I've done.