Reality TV star Kristin Cavallari found herself in police custody in Chicago, Illinois on Friday morning (06Sep13) after a mix up over her driver's licence. The former The Hills star, who is married to American footballer Jay Cutler, took to her Twitter.com page to reveal all about her legal run-in, suggesting she was busted for not having a valid driver's permit. In a post online, she wrote, "Who knew having a California driver's license in Illinois was a CRIME to be escorted to the police station to post bail?!! What a morning." Cavallari has been spending time in the state with her husband, who plays for the Chicago Bears, but she insists she isn't a full-time resident of Illinois: "I still have an apartment in LA so I'm a resident of California." Drivers in Illinois are required to apply for a new state licence after living in the area for 90 days, or face citation.