Kristin Cavallari jeans the hills sweater DUI

After spending her Labor Day weekend in Nashville, Tennessee with new beau, NFL pro Jay Cutler, Kristin Cavallari is back in Los Angeles. The perky blonde and the Chicago Bears quarterback were spotted partying it up on Saturday at the nightclub Winners, and the next day Kristin tweeted, "This has been one of the best weekends of my life. Yeehaw!"

However, the reality starlet looked pretty down in the dumps when we saw her walking into a medical building on Thursday, but can you blame her? She's probably missing her new man, and after the news got out that her mom was busted for a DUI last month, we can totally understand why she'd be a bit bummed!