New BFFs Paris Hilton and Britney Spears will host the Billboard Music Awards next week in Las Vegas. "There are no plans for either to perform, but they will host the event together," a source says. "They'll be fun onstage together." The show is set to air Monday night at 8pm on FOX. Schedule to perform are Janet Jackson, Gwen Stefani, and Carrie Underwood. Let's hope the hosts wear underwear and keep their legs closed.source