Ronda Rousey (7-0 MMA, 1-0 UFC) stayed unbeaten in her MMA career.

— NISSI ICASIANO (@Nissi_Icasiano) February 24, 2013

Ronda Rousey defeats Liz Carmouche via armbar in Round 1 at 4:49 to become the first UFC Women's Champion! twitter.com/BleacherReport…

— Bleacher Report (@BleacherReport) February 24, 2013

Oh and @iamgirlrilla = heart and skill. Put Ronda in trouble for a bit there & would've tapped a lot of fighters out there. #UFC157

— Kenny Florian (@kennyflorian) February 24, 2013

.@iamgirlrilla is the definition of CLASS. Not only a great fighter, but a great person. You could tell. #UFC157

— Guy named Anthony(@IrrelevantAnth) February 24, 2013

And Ronda Rousey is the first UFC Women's Champion!

Ronda Rousey def. Liz Carmouche via arm bar at 4:49 of Rd 1 #UFC157

— Bloody Elbow (@BloodyElbow) February 24, 2013

Rousey gets a hold of Carmouche's arm and Rousey wins by tap out!

Standing room !!! @rondarousey takes it! #UFC157

— UFCONFOX(@UFCONFOX) February 24, 2013

And they're back on the mat. Rousey has a tight headlock on Carmouche, and she's delivering shots to her face.

Carmouche torqued a tight face crank and followed Rousey's escape with a nice upkick. #UFC157

— Bloody Elbow (@BloodyElbow) February 24, 2013

And Carmouche is on Rousey's back twisting her face.

Carmouche takes her back! #UFC157

— Bloody Elbow (@BloodyElbow) February 24, 2013

And Rousey has her on the ground already.

The fighters meet pre-fight. And we're underway!

This entire arena is standing and going nuts.

— Ariel Helwani (@arielhelwani) February 24, 2013

Rousey gets loose as she's introduced. She has her game face.

Ronda Rousey about to chose an arm..equal of @nfl coin toss..inevitable heads/tails & won't land on it's side. So Left or Right arm? @ufc

— Joey Oddessa(@MMAOdds) February 24, 2013

Speaking truthfully, though, I don't expect this to go very long. Credit to Carmouche, but this should end quickly. I guess we'll see.

— MMAFighting.com (@MMAFighting) February 24, 2013

Breakdown of both of our main event fighters.

Rowdy's got the mean look on. She looks ready to fight. She hits the cage and the place goes nuts

— Kevin Iole (@KevinI) February 24, 2013

Rousey enters to Joan Jett's "Bad Reputation".

Rousey making her way to the cage. Both ladies focused as Carmouche seems unfazed by the crowd pop for her opponent. #UFC157 #History

— UFCONFOX(@UFCONFOX) February 24, 2013

Rousey's fighter bio.

And here comes Sgt Carmouche on her way to the cage. She'll have the honor of being the first woman to step into the Octagon

— Kevin Iole (@KevinI) February 24, 2013

Carmouche enters to "Satisfaction" by Benny Benassi. She's pounding her chest and is clearly pumped.