Usually she's all smiles and giggles, but last week on the set of Knight & Day, Cameron got caught with a serious looking face! Maybe she was just getting into character for the action/comedy … or maybe she got a…

Cameron may not be the best looking movie-star IRL, but all done up on set she always looks amaze, and today on the Salzberg, Vienna set of Knight And Day was no different! Ok, we're still not really buying her…