Holly Madison's world is about to get even bigger! Not only is the Girls Next Door star launching her own spin-off show, Holly's World, on June 13 on E!, she reveals to Life & Style that she's hard at work on her first book. "I'm writing a book about Las Vegas," she tells Life & Style. For research, she took a wild road trip from LA to Sin City, with stops at "freaky roadside attractions," she says, and a haunted hotel in Death Valley. That certainly sounds like a world away from the Playboy Mansion!

Photo Credit: Courtesy of E!