James Cameron joined an exclusive club Sunday — one that includes only himself … he’s the sole director in history with three movies that have crossed a huge money milestone.

That benchmark is the $2-billion line, which his latest film — ‘Avatar: The Way of Water’ — crossed Sunday … now marking the third such flick of his to have achieved it at the international box office. His other two crown jewels … ‘Avatar’ ($2.9B) and ‘Titanic’ ($2.1B).