Naw, I never really got that they were close at all. They hung out every once in a while--but I never got the impression that they were close friends. Maybe it's just because Kate usually spend her time teasing the guys (or, on the flip side, and when it's convenient, being the damsel in distress) and we're not used to seeing her with other female characters.

Or it might just be because I hate Kate. I guess that is a possibility. But yeah. :) Totally didn't get impression of friendship. Right. Aheh. Sorry. I rambled.