For me, Bastila Shan only becomes hot when she turns to the dark side which I guess means she isn't a Jedi anymore.
The OP asked for the cutes not for the hottest. At first I wanted to interpret the question totally different and post a picture of some younlings at training. But I figured some people here would take it the wrong way. That and I couldn't find a decent picture.
definitely Bastilla, which is weird since she's a game character. But, hey, she's a brunette what can I say?