Ronda Rousey has just made MMA history becoming the first female fighter to join the UFC. Check her out below!

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Rousey — a former U.S. Olympian — has officially joined Dana White’s MMA organization … and automatically becomes the 135 lb women’s champion.

We’re told 25-year-old Ronda will defend her title in 2013 — possible opponents include Sara McMann, Cris Cyborg and rival Miesha Tate.

Rousey has been fighting in Strikeforce since last year and emerged as a superstar … beating the living crap out of just about everybody she’s faced. In fact, she’s undefeated. Just check out this highlight reel.