Joanna Jedrzejczyk is a Polish MMA fighter and former Muay Thai kickboxer who fights in the Ultimate Fighting Championship's women's flyweight and strawweight divisions (UFC). Joanna Jedrzejcyk's net worth is $4 million as of 2021. Jedrzejczyk was born on January 4, 1987 in Krakow, Poland. She started practicing martial arts at the age of four after her father brought home a toy from Japan that impressed everyone in the family with its simplicity and effectiveness. Her first teacher was Japanese but later on she moved to Thailand where she trained under Chonlatarn Piriyapong. When she was 15 years old, Jedrzejczyk decided to move back to Poland because she felt more comfortable speaking Thai there. In 2004, at the age of 16, she returned to Thailand for further training. Two years later, she became the youngest person ever to win a title in Lumpinee Stadium when she defeated Moria Poonsukan by decision for the vacant WBC Muay Thai World Title. After winning five titles in Thailand, Jedrzejczyk returned to Poland in 2009 and immediately signed with the UFC. She is now one of the highest paid fighters in the world. Currently, Jedrzejczyk is fighting for the UFC Women's Strawweight Championship against Valentina Shevchenko.