Ronda Rousey has signed a contract to fight in the MAIN EVENT at UFC 157 in February ... the first ever female fight in UFC history ... TMZ has learned.
Sources tell us the 25-year-old Olympic medalist will step in the ring with 28-year-old Liz Carmouche ... a highly-ranked MMA badass who served in the U.S. Marine Corps.
Rousey was named UFC champion (female 135 lbs division) when she signed with the organization -- and her belt will be up for grabs.
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*Editor's Note: This story was subsequently confirmed by the UFC's official Twitter: Ronda will fight February 23 at the Honda Center - she'll fight Liz Carmouche in the main event.
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