Nicole Scherzinger says being famous is hard work.

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The Pussycat Dolls singer – who is currently dating British Formula 1 racing driver Lewis Hamilton – insists fans don’t realise just how much effort goes into being a pop star.

She said: “It’s not as glamourous as people think. It has its ups and downs. There can be a lot of intrusion into your private life, but I want to be known for my music.

“It’s not partying all the time – sometimes when I get the chance I am too tired to party! People don’t see the work that goes in to touring but it’s definitely worth it.”

Despite being in a relationship with Lewis, Nicole thinks one of the strangest things about fame is the number of different men she is romantically linked with.

The 30-year-old star – who was recently reported to be dating Black Eyed Peas star after allegedly being spotted smooching with him at Los Angeles’ Opera nightclub – added to MTV: “I find that sort of thing funny. That was the funniest thing when someone told me I was supposed to be dating Will. He is like my brother, I don’t know when the last time I saw him was. He has been on tour.”

Although Nicole is remaining coy about her relationship with 22-year-old Lewis, she knows what qualities her perfect man should have.

The Don’t Cha singer – who first met Lewis at the MTV Europe Music Awards in Munich, Germany, last November – said: “I look for someone with a good heart. Someone who is confident and successful and goes after what he wants. I love a guy with a great sense of humour.”