I don't particularly think it's disgusting - but I think it's totally fascinating to find out a girl like Julia is into things like this.
I know what you mean about her being a bit dumb. I've seen interviews with her, and she doesn't strike as being particularly intelligent. She seems downright gullible, in fact - it's hardly surprising she's in the porn industry, and it really shouldn't be too surprising to find out she lets herself be filmed getting pissed on.
I managed to find her Yahoo Groups and got the pics - there's a set with another girl in there too, with both of them pissing on each other.
Interestingly enough - her tits seem smaller in these pics.
I'd be interested to see these new "brunette" ones though...