American Idol alum Kimberly Caldwell (she placed seventh in the show's second season) returned to the spotlight when she caught the eye (and the heart) of American Idol winner David Cook.  David recently proposed with a $54,000 engagement ring.  Yet, according to Star magazine, Kimberly was caught getting a little too cozy with an LA bar manager named Ryan Der on December 29.

'Everyone could see she was really letting loose,' an insider tells Star. 'She and Ryan were laughing together as they threw back beers and vodka cocktails.' " 

It supposedly didn't end there.

Before long, says the insider, Kim and Ryan, a tall hunk with a shaved
head, were "grinding on the dance floor. They started playfully
kissing, but that quickly led to long lip locks until they were full-on
making out.” 

This is Star, so whether or not it's true remains to be seen.  Hopefully it's not.  David seems like a genuinely nice guy.

Photos by Wenn.com