Kristin Cavallari I Can't Catch a Break!

Kristin Cavallari's nursing a bum wing after her car accident in Chicago, and the poor girl desperately needs a win.

It's been a rough couple of months for Kristin -- after dealing with her brother's death in December ... she got hit by another driver in Chicago last week. As she said to the photog at LAX on Monday ... "I'm just happy it wasn't worse."

Check it out ... KC reveals her injury, and somehow manages to flash a little optimism.