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WHO WAS THAT BADASS 10-YEAR-OLD WHO STOLE LAST NIGHT'S 'GAME OF THRONES'?

On last night's Game of Thrones, we finally met Lyanna Mormont, the Lady of Bear Island and niece of the late Jeor Mormont, Lord Commander of the Night's Watch. Her only scene lasted just three minutes, but that was all this 10-year-old spitfire needed to steal the whole episode.

Lady Mormont, played by newbie Bella Ramsey, proved that youth is no excuse for poor leadership (*cough* TOMMEN *cough*). The pint-size actress nailed the commanding attitude necessary to survive and prosper in the world of Thrones. Twitter lit up over her defiant speech to Jon, Sansa, and Davos' request for support on the battlefield.

"We were excited about the prospect of the character, because she's mentioned in passing in the previous season," co-showrunner D.B. Weiss tells us in the after-episode commentary. "The more we thought about it, Jon is gonna come up against so many old guys with beards in the North, that, like, what if she was a tougher audience?"

Tough doesn't even begin to describe Ramsey's performance. Weiss added, "It also was terrifying because it's putting a lot of dramatic weight on the shoulders of somebody who needs to be very young, and we're very lucky to have found Bella because she is doing such a great job of just talking smack to these guys who are used to being the heroes who make proclamations."

And he wasn't the only one blown away: as co-executive producer Bryan Cogman said in an interview with Entertainment Weekly, "Bella is a terrific young actress -- the whole cast and crew were very impressed. I think, much like the character does with Jon, Sansa, and Davos, Bella kept Kit, Sophie, and Liam on their toes!"