Kirsty Bertarelli

When you think about the richest women in Britain, you probably think of J.K. Rowling, right? Surprisingly, though, the richest woman in the UK is actually Kirsty Bertarelli, a former Miss UK winner and Miss World runner-up.

Most of her impressive wealth, however, is actually due to her husband, Ernesto Bertarelli, who is worth an estimated $7.9 billion. The couple got married in 2000 and have been together ever since. Today, they live in Switzerland with their three children.