Sydney Sweeney looks unrecognizable in the first-look trailer for the new movie, Christy .

RadarOnline.com can reveal the Euphoria actress, who has been dubbed " Hollywood's sexiest star," piled on 30 pounds to play the role of boxer Christy Martin and looks a world away from her usual glamorous self in the promo. Article continues below advertisement

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Soundtracked by Stevie Nicks' 1981 hit Edge of Seventeen , the teaser shows Sweeney looking dowdy with a brown curly mullet before she enters the ring looking disheveled in the gut-wrenching scene.

The movie, released on November 7, depicts Martin's rise to fame as one of the first notable female boxers.

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