In the beginning of the movie (when she's just the nerdy boss), her hair is messier and she's wearing her jacket, glasses, and minimal make-up. As she shifted to love interest, suddenly her face and hair are done, she's wearing less clothes, and her glasses disappeared. Even though the time lapse for the characters was only a couple of hours. And her complexion seemed to lighten as well IMO it's not as noticeable in pics as it is on video. I noticed it the first time I saw this, the more Dante realized he loved her, the "prettier" she got.
Beginning:
http://images1.fanpop.com/images/pho...9-1024-576.jpg
Mid-movie:
http://images1.fanpop.com/images/pho...9-1024-576.jpg
ETA: I adore her, too. She is so freaking cool. I'm still looking for a DVD fram so I can put my autographed DVD next to my RENT movie poster.