In a veiled attack against her estranged multi-millionaire husband Sir Paul McCartney, the 39-year-old former model slammed the world's wealthiest people when she gave a 90-minute speech to Trinity College Dublin's debating society in Ireland .
Heather said: "Sadly, you have to mix at a certain level of people to raise the level of funds you need to bring about the greater good. Because people are very snobby.
"These people who have lots of money, they're either snobby or they're stingy. If you have lots of money, you have to be stingy - because why would you want that amount of money?"