Admit it: you've added pictures of celebs looking major at amfAR fundraisers to your Pinterest, but you're not actually sure what the (oddly capitalised) organisation does. Well, here's a heads up: it's the world's pre-eminent HIV/AIDS charity, it was founded by Elizabeth Taylor in 1985 and it has so far raised a phenomenal $388 million to help fight the spread of the disease. And how did they do it? Thirty years of star-studded galas and fundraisers, that's how. Ahead of this year's New York Gala, taking place this week, here are seven of the best dresses ever to be donned in the name of charity.