It's not revealing any major Lost spoilers to state that Evangeline Lilly's character of Kate Austen is one serious broad.
Heck, you'd find it difficult to crack a smile, too, if you had murdered your father, crash landed on an island and been forced to deal with mysterious smoke monsters.
The convoluted nature of Lost requires such attention to storyline detail that viewers often forget something important: Lilly is gorgeous!!!
And, as you can tell by this photo, occasionally a goof ball:
Click on the following pics for more beautiful shots of Evangeline Lilly...