Answer
Holly Holm has won two MMA world titles. The first was the UFC Women's Bantamweight Championship, which she won in 2015 by defeating Ronda Rousey by knockout. The second was the WBA (Super) Women's Featherweight Championship, which she won in 2017 by defeating Germaine de Randamie by unanimous decision. Holm is the only woman to have held both titles simultaneously.