Princess Diana was of course afforded the spoils of royal life. But after she got divorced, she was granted a massive settlement. As noted by The News, Diana walked away with an estimated £17 million, which is about $23.7 million. But that was in 1996, and it is estimated that in today's money, she settled for about £31 million, which is equivalent to $43.2 million. On top of her massive pay out, Diana was granted an annual allowance of £400,000 (about $557,000) — but of course, that's about £730,000 today (or roughly $1.01 million). 

Apparently, Prince Charles did not take the news about Diana's settlement very well. In her book, "The Diana Chronicles," Tina Brown wrote, "The Prince was first stunned, then outraged, when, in April [he was] presented with Diana's final £17 million term." But Diana recognized that although the situation was devastating, she had the upper hand. Charles was reportedly "desperate to be rid of her," so she used the opportunity to negotiate on her own behalf. Diana allegedly went to Queen Elizabeth and made it clear that if her terms weren't fulfilled, she wouldn't agree to the divorce.