I'm probably a little biased on this - my best friend graduated from Sara Lawrence College with Liz Rohm (the actress who plays Kate). They were both theatre majors. Not to be a rumor mongor (which is what someone always says when they're about to do some rumor mongoring) but not only do I think Elizabeth Rohm isn't much of an actress (and therefore Kate isn't very interesting to watch), but she's also a pretty horrible person. Oh, the horror stories I've had to endure about her! Backstabbing, stealing other girl's boyfriends, using sex to get ahead....
On a lighter note, I've seen her college graduation picture. She had black hair, a longer nose and a bigger chin. When my friend first showed me her yearbook I refused to believe that it was the same person, until another friend who went to school with them confirmed it.