The Queen has a very lucrative side hobby which has earned her £100 million

She may be the Queen, busy with various royal engagements, duties and responsibilities, but when the monarch does have some down time, what does she get up to? A spot of gardening? Eating at her favourite restaurant? Catching up on The Crown?

Well, it turns out that the Queen has a rather interesting side hobby - and it has made her a fortune (£100 million, to be exact).

Her net worth is estimated to be worth $520 million (approximately £415 million), according to Forbes, but she's also bringing in the coin thanks to her extensive stamp collection. According to The Telegraph, she has several that are worth a pretty penny including a Mauritian stamp valued at £2 million.

Royal expert Phil Dampier told Fabulous that she loves to show them off to visitors when they come to see her at Buckingham Palace.

'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.'

Queen Victoria’s second son, Prince Alfred, started the stamp collection in 1864 and it seems the Queen has decided to keep it going.

Brb, starting a stamp collection immediately.