Jeannette Walls of MSNBC.com reports *NSYNC star Justin Timberlake has been shopping his autobiography at the Frankfurt book fair. Bidding is “frantic” according to a source, and is said to have reached seven figures. “He’d put out feelers about doing a book a few years ago,” the source explained, “but at that point, he hadn’t had his heart broken by Britney. He hadn’t lived as much as he has now. And of course, there wasn’t Cameron.” As for Cameron Diaz, another source says their relationship has hit a new level. “She’s moved in with him and it’s intense,” blabbed the insider.