It is being rumoured that Jessica Simpson has been a brat on the set of her new film, Major Movie Star, but her co-star Vivica A Fox has come to her defense.“Those vicious lies they put out were just that — lies,” Fox (43) said during an event for the fashion label Young, Fabulous & Broke at the LG House in Malibu.In fact, Fox said that Simpson was anything but a diva. “She was so much of a team player. She was gracious and so down to earth.”