Sydney Sweeney has shared new photos of herself playing boxer Christy Martin in an upcoming biopic, where she sports a very ’90s mullet and has added some muscle to play the former athlete.

“Well the cat’s out of the bag thanks to some paps in bushes so here’s a little BTS from my film I’m working on right now,” Sweeney wrote on Instagram.

She’s starring as Martin in an untitled sports biopic, directed by David Michod, that recently started production.

My brother is gonna be an extra on set tomorrow. Looks like they’re shooting some of the boxing scenes.

If I wasn’t working tomorrow I would’ve too

mannn that’s so f***ing tuff