Kristin Cavallari isn't jumping into another serious relationship! Days after she was spotted packing on the PDA with comedian Jeff Dye in Chicago, multiple reports claim "The Hills" alum is still very much single — despite the romantic rendezvous. "They are not dating," a source told E! News. "They met once. She's single, having fun and enjoying herself. She can kiss whoever she wants." Access Hollywood has reached out to both of their reps for comment