Anastasia Valeryevna "Nastia" Liukin (Russian: Анастасия "Настя" Валерьевна Люкин; born October 30, 1989) is a retired Russian-American artistic gymnast. She is the 2008 Olympic individual all-around champion, 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 and Simone Biles for the second-highest tally of World Championship medals (among U.S. gymnasts). Liukin also tied Miller's record as the American gymnast having won the most medals in a single non-boycotted Olympic Games.