Hannah Montana star Miley Cyrus, one of the most successful touring acts of 2007, will continue her Best of Both Worlds tour with an additional 14 shows in January. Tickets are scheduled to go on sale Saturday (Dec. 15) for the new dates announced for Detroit, Milwaukee, Chicago, St. Louis and other cities in Arizona, Texas, Louisiana and Florida. She'll be performing two nights each in Las Vegas and Orlando, Fla. The 15-year-old daughter of Billy Ray Cyrus sold out 55 concerts this year. Ticket brokers resold some of the tickets for as much as five times the face value.