Kristin Cavallari has a new man in her life! The Uncommon James owner is dating country singer Chase Rice, a source tells ET.«Kristin and Chase Rice have been seeing each other casually. They have hung out in Nashville and are having a good time together and getting to know each other,» the source says.With the relationship being so new, the source adds that «Kristin is not in a rush get into a serious relationship. She is doing her thing and enjoying herself.