One of the stars of Game of Thrones has shaved her head for the purpose of committing to her character in the next Hunger Games movie.

Natalie Dormer, who plays the mysterious Margaery Tyrell on Game of Thrones, shaved her head for her upcoming role in The Hunger Games: Mockingjay - Part 1. The actress debuted her new look at the SAG Awards on Saturday, showing off her half-shaved head to the world. See her new look here.

"It's been hidden for 3 months. It happened back in October. I was, you know, waiting for the right moment," Dormer told Entertainment Weekly. "I've never shaved my head before. My man has his head shaved, so... I'd rub it and think, 'This is gonna be me!'"

Dormer will play the character Cressida in Mockingjay, who is described in the book as having a shaved head with tattoos of green vines.

"Francis Lawrence, the director of Mockingjay, and I discussed it and I took the job on the premise that I would possibly [have to] shave my whole head," Dormer said. "I'm actually really pleased that we went halfway because I think it's more the Capitol... and that's where Cressida comes from. She comes from the Capitol, so she's got a stylized thing going on and now she's turned rebel. I think it's right for the character."

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Dormer has already wrapped production on Game of Thrones season 4, so it won't interfere with her look in the new season.

Game of Thrones season 4 premieres Sunday, April 6 at 8 p.m. on HBO.

Watch the Game of Thrones season 4 trailer featuring Dormer here:

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Game of Thrones, Natalie Dormer, Game of Thrones Season 4 Premiere