October 17, 1981 (41)
Holly Holm is an American mixed martial artist who competes in the Ultimate Fighting Championship. She is the former UFC Women’s Bantamweight Champion, and a former professional boxer and kickboxer. She was a multiple-time world champion in boxing, defending her titles 18 times in three weight classes, and a two-time Ring magazine fighter of the year (2005, 2006). She is ranked by BoxRec as the best female professional boxer of all time. She has the notable distinction of being the first (and currently only) fighter to hold a world-boxing title and a UFC title.