Really? To me they look very friendly. We can only see Athina's face, but she seems very happy to meet charlotte
I agree 100%. I think if they looked a little stiff, it was because of one of these reasons (just my opinion):
1) Athina came up rather suddently, perhaps taking the party by surprise, as everyone else but Char is looking like they don't know what's going on.
2) The photographers (less likely, considering they all seem perfectly relaxed in other pics, but still possible, I suppose)
But I will say that I agree with Horseygal that they are just acquainted, albeit always friendly acquainted, socially friendly, but not over-friendly.
I just always
wished they would be friends, like best friends, but accepted long ago it ain't gonna happen. I think the media has paired them together off and on, esp. when they were little kids, as part of an exclusive "richest kids club", and then there are the coincidences:
1) Both lost a parent at a very young age
2) Both inherited their own island, albeit one being quite "more important" than the other one
3) Their grandfathers *hated* each other!
4) Their mothers were sort of rivals in their own way on the social scene, weren't they?
5) The equestrian thing, yada yada