Her name is Ronda Rousey, and she is a killing machine. She's now the first ever female to join the male dominated Ultimate Fighting Championship (UFC)
Rousey -- a former U.S. Olympian -- has officially joined Dana White's MMA organization ... and automatically becomes the 135 lb women's champion.
25-year-old Ronda will defend her title in 2013 -- possible opponents include Sara McMann, Cris Cyborg and rival Miesha Tate.
