Work mates and their wonderful ways

What would you girls do?  I really need to vent, and would be interested in tactful ways of dealing with my situation. 

There are 3 of us secretaries at work.  I am the newbie and have my own office, the other 2 are joined at the hip and share another office.  At morning tea time the 'designated spot' is their office. They virtually ignore me and I feel pretty uncomfy sitting there. There's another morning tea group but I don't want to rock the boat by suddenly going there, plus I'm shy. 

Then when one of my colleagues is on leave suddenly the other one will go all 'best buddy' on me, even gossiping to me about the other.  Later, when both staff are back together I go back to being the spare wheel. 

They are very negative, gossipy, destructive types and I'm not bothered to be their friend, but I try to be polite as I have to work with them. 

Both of them are on leave at various stages next week, so obviously they're going to try their two-faced friendliness again and want to share gossip about the other - but I'm just done with it. 

start going out of the office at breaks, get busy doing other stuff. be friendly but dont go out of your way to be with them. get to know the other people better, i know its hard but sometimes we just have to put ourselves out there. Oh and you could make the designated spot our office sometimes. Tell them just for a change come to my office...

I agree with Bizzy, go to work, do your job, enjoy the fact that you only have to endure their two faced ness while you are work, be friendly, get to know the rest of your colleagues, and hopefully you'll find someone you gel with.