Britney Spears is close to finalizing a $15 million deal to serve as the new superstar judge on Simon Cowell's talent show The X Factor, according to online reports. The "Toxic" hitmaker has been rumored to be in talks to take a seat alongside Cowell and producer Antonio "L.A." Reid on the panel for weeks and now insiders claim the big announcement is imminent. Spears is said to be ready to sign on the dotted line after being offered a $15 million payday - after she reportedly turned down $10...