Jessica Simpson

Jessica Simpson’s acting career has been given a boost - her new co-star in Blonde Ambition insists the pop star is one of the most professional people she has even met on a film set.

Actress Rachael Leigh Cook admits she feared Simpson would be an ill-prepared diva, surrounded by an entourage - but she was more than pleasantly surprised. The Josie + The Pussycats star tells online gossip columnist Marc Malkin, “She was really sweet and cool. I was really taken by surprise how reserved she is. “She’s really open about saying, `This is my first time having more than 10 lines in a movie. I’m kind of new here.’ “She took the job really seriously. She wasn’t out partying all the time… She would go home and be at work the next day.”

And Leigh Cook was further impressed when she realized Simpson really is the brains behind all her business endeavors. She adds, “I said, `So, you have this clothing line, come on, is that really you?’ And she said, `Yeah, absolutely. When they first manufactured this coat, the belt was too high, so I put it down because it makes the line look better.’ She’s really involved, which I was truthfully surprised by.”