Camilla Parker-Bowles
Camila Parker-Bowles married into the royal family after Princess Diana passed away. Prince Charles married Camila in 2005, but before then, she was worth quite a bit of money already. She was working as a receptionist for a major company in the UK, and she had amassed roughly $5 million in personal assets before she became royalty. She is still "worth" $5 million, but that's without combining her assets with her rich husband's.