While many know that Queen is very wealthy, with a net worth of €500million according to Forbes, not many know of the Queen's hobby that could potenially add a lot of money to that net worth - taking it up by millions of pounds.
The Telegraph reports that Queen Elizabeth II has an extensive stamp collection that is so big, she even has one stamp that is worth €2million alone.
It's a Mauritian stamp that was given to her to celebrate her Golden Jubilee in 2002.
Royal expert Phil Dampier said that the Queen loves her stamp collection and often shows it off to visitors.
He told Fabulous: “The Queen loves showing her stamp collection to visitors, say heads of state who stay at Buckingham Palace.
“It is one of her pride and joys, not only because she owns some of the world’s most valuable stamps, but also because she has built on a family treasure and feels she has done her father and previous monarchs who owned it proud.”
The collection was originally started by Queen Victoria’s second son, Prince Alfred in 1864 and has since been passed down on to other family members.