SYDNEY Sweeney has totally changed her look as a boxer for a role that could earn her an Oscar.

The 27-year-old mega actress had to lose 30 pounds in order to star in the boxing biopic, Christy.

The movie is based on the astonishing life and career of champion boxer Christy Martin .

The story is played out by Euphoria 's Sweeney, who underwent a drastic transformation for the role.

And the trailer has shown just how different the model actress looks.

Sweeney is spotted much heavier than ever before .

Footage from the movie shows her taking punches while laced up in the ring.

Fans reacted to the trailer and have called for Sweeney to win her first Oscar award.

"She looks like a potential Oscar candidate," one wrote.

"I know this is going to give her an Oscar nomination,"

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