SIMON Cowell has a giant trailer on the set of US X Factor. Judge Nicole Scherzinger claims the music mogul who left the UK version of the talent show to concentrate on the new program acts like a diva behind the scenes, but he sometimes lets her use the toilet in his phenomenal mobile home. Hes a bit of a diva, Im not going to lie, Nicole said. Hes got one of those huge Will Smith trailers. Theyre pretty phenomenal, I like to go and ask if I can use the toilet. He lets me every now and then. The former Pussycat Dolls singer admits the 52-year-old executive producer can be very unpredictable on set, but she is inspired by his passion for music. -Agencies Were pretty cool. I teach him a thing or two. Hes like a box of chocolates, you never know what youre going to get when you come into work, she added. But hes inspiring. He knows what he wants, hes very passionate about his work, as am I. I remember when I first worked with him last year in the UK, there was crazy music like We are the Champions. I was like, 'What kind of singing competition is this? He said, 'Nicole, you know how passionate you are about your music? Thats exactly how I am.