Did K-Fed's Bomb Bring Down Britney?

Last Friday, cameras caught Britney Spears shopping in Los Angeles, acting as nice in front of the photogs as we have seen her -- smiling, laughing and even posing for pics. On Monday, photogs spotted Britney in West Hollywood stopping at the popular Chinese restaurant Chin Chin. No smiles, no waves, no nothing.

What could have happened in the days between that made Britney so sour? Hmmm, let's think... Oh yeah! K-Fed stunk up the Kid's Choice Awards. That could have been it. Of course, it could be something else. Could be anything really.

But we're going with K-Fed.