Cecilia Carmen Linda Brækhus (born 28 September 1981) is a Norwegian professional boxer and former kickboxer. In boxing she has reigned as the undisputed female welterweight champion since 2014, and is the first woman in any weight class to hold the WBA, WBC, IBF and WBO titles simultaneously. She is also one of only seven boxers in history, female or male, to hold all four titles simultaneously, along with Bernard Hopkins (2004–2005), Jermain Taylor (2005), Terence Crawford (2017), Oleksandr Usyk (2018–2019), Claressa Shields (2019–), and Katie Taylor (2019-). In 2017, the Boxing Writers Association of America named Brækhus their inaugural Female Fighter of the Year. Guinness World Records awarded her with three recognitions in 2018: the Longest Reigning Female Boxing Champion, the Longest Reign as a Four-Belt Undisputed Boxing Champion, and the Most Bouts Undefeated by a Female World Champion Boxer. As of December 2018, Brækhus is ranked as the world's best active welterweight, and third best pound-for-pound female fighter by BoxRec.