There's a lot of talk about skinny celebs. What do they eat? Do they eat? What's their workout regimen? Are they on amphetamines? But these aren't really the most important questions. The real question, is are they too skinny to be sexy? We love a voluptuous woman a la Adriana Lima, but we also kind of love Kiera Knightley. So let's take a peek at the skinny girls that pose such a conundrum of ogling.