Kristin Cavallari wore all-black workout clothes to go running in Chicago yesterday. She's kicked up her fitness regimen since becoming engaged to football player Jay Cutler in April, and Kristin hasn't been shy about flaunting her figure. Kristin Cavallari wore a bikini during a Malibu photo shoot last month, and she was back in a two-piece over the weekend to hang on the beach in Santa Monica. Her wedding isn't until next Spring, which means she has plenty of time to maintain her fit body and plan for the nuptials. Her man Jay might be able to help her prep for the event if the NFL lockout continues, though he's recently been busy practicing with the Chicago Bears.