Elizabeth Hurley keeps letters from her "crazy fans" in a file labelled "Nutters"

Speaking on 'Watch What Happens Live!' in the US, she said: "In the office in London, we have a file called "Nutters". And every time, well, particular people send letters - they still send, you know, mail - they have to go into the Nutter file.

There's one nutter who - I don't even know if I'm allowed to say this - but he only stalks two people: I'm one of them and the other is the Queen of England. I probably shouldn't be saying any of this on TV. Take it all back!"

The 'Royals' star - who has 1.4 million people on Instagram - recently admitted that she holds back on social media because she's famous and would prefer to be silly.

She said: "It's a good tool for business but if I wasn't in the public eye I'd probably thoroughly enjoy having a very small private account, followed only by my friends - and then I could be a great deal sillier.

"And I do feel in our very busy lives that it's a brilliant way of keeping in touch; if you bump into someone, you feel like a bit of a stalker really as you know exactly what they've been doing, but I kind of like it.

"It's a force of good unless you're a teenager and do nothing but social media - but I probably spend 10 minutes a day on it."

Elizabeth previously "made a vow" to "keep quiet" about her personal life.

When asked about her love life, the mother-of-one - who has 17-year-old son Damian with ex-partner Steve Bing - said: "I made a vow a few years ago to keep quiet about my private life for a bit, because I decided I talk too much about it in the past! So I'm not going to answer that, but I will say thank you for asking!"