Demi Lovato announced today the North American dates for her all-new World Tour that kicks off on Sept. 6 in Baltimore, Md. at the Baltimore Arena. Produced and promoted by Live Nation and sponsored by the Tampax and Always Radiant Collection, the tour will make stops in 25 cities across the United States and Canada, with shows planned in San Diego, Chicago, Montreal and Miami, with additional cities to be announced soon. Christina Perri and MKTO will join Demi's World Tour as special guests.