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Anastasia "Nastia" Valeryevna Liukin (; Russian: Анастасия Валерьевна Люкина Russian pronunciation: [ˈlʲʉkʲɪnə]; born October 30, 1989) is a Russian American former artistic gymnast. She is the 2008 Olympic all-around champion, a five-time Olympic medalist, the 2005 and 2007 World champion on the balance beam, and the 2005 World champion on the uneven bars. She is also a four-time all-around U.S. national champion, winning twice as a junior and twice as a senior. With nine World Championships medals, seven of them individual, Liukin is tied with Shannon Miller for the third-highest tally of World Championship medals among U.S. gymnasts. Liukin also tied Miller's record (later equaled by Simone Biles) as the American gymnast having won the most medals in a single non-boycotted Olympic Games. In October 2011, Liukin announced that she was returning to gymnastics with the hopes of making a second Olympic team. Liukin did not make the 2012 Olympic team and retired from the sport on July 2, 2012.