Nicole Scherzinger says being famous is hard work.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 wi...

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