Miley Cyrus has made musical history in the U.S. by becoming the youngest artist to have two number one albums in under a year. The 14-year-old, whose father is Achy Breaky Heart singer Billy Ray Cyrus, shot to the top of the American charts last week (04Jul07) after selling 326,000 copies of her new double album Hannah Montana 2/Meet Miley Cyrus. Cyrus' first disc Hannah Montana, named after the teenager's Disney Channel TV series of the same name, jumped straight to the top of the U.S. charts in October 2006.