hahaa. It's a terrible movie, but having seen it I'll answer your question. Yeah Christine Larkin is the 'nottie' at least at first. They give her warts, hairy legs, etc but as the movie goes on she gets gradually hotter and hotter and by the end he picks her over Paris.
I know Paris is hated but in the end, the nottie was not written being hotter than Paris. Not nottie was better on the inside so when she got decent looking, the guy fell for her. In all reality, as a whole society, people consider tall, lanky blonde more attractive than a short, stubby plain brunette, as much as people hate that fact, they need to face it. In some cases, innocent tall model type blondes are hated for this reason, not talking about Paris being hated for this reason, but innocent girls in general.