Kristin Cavallari & Brody Jenner's Happy Ending

2/26/2010 4:30 AM PST BY TMZ STAFF
Brody Jenner is back in the driver's seat with Kristin Cavallari.

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The former couple showed up together to Happy Ending lounge in Hollywood on Thursday.

Shhh! Don't tell Avril Lavigne or Jayde Nicole or ...