Natalie Dormer loves getting out of her comfort zone ... and her clothes!The "Game of Thrones" star, who plays Margaery Tyrell, goes topless in the April issue of GQ -- striking a sultry pose in little more than heels, black leather Emilio Pucci short shorts and some well-placed hands.Fans of the HBO series may notice something different about her in the sexy shoot though: That hair!Dormer recently buzzed half of her head in order to play Cressida in the final two films of "The Hunger Games" franchise, "Mockingjay" Parts 1 and 2."I love going out of my comfort zone. I live to go out of my comfort zone," Dormer tells the mag of her new look ... and life in general. "Obviously, you have quieter years than others and you don't go jumping out of a plane every day."The look is definitely a difficult one to pull off -- but we gotta admit,...