Sydney Sweeney looks unrecognizable with brown mullet as boxer Christy Martin on biopic set revealed that…

Sydney Sweeney underwent a complete transformation for her role as Christy Martin in David Michôd’s upcoming biopic about the boxer.

The 27-year-old actress looked unrecognizable while shooting the yet-to-be-titled film in North Carolina over the weekend, rocking a shoulder-length mullet in lieu of her typical blond locks

The “Anyone But You” star tied a blue bandana around the dark wig and hid her famous curves under baggy pants, a tan T-shirt and an oversized zip-up.

She completed the sporty outfit with a pair of white sneakers and seemingly went makeup-free for the day of shooting.

Sweeney’s wardrobe for the movie — which tells Martin’s life story — has been mainly ’90s sports attire, a far cry away from her typical sultry looks.

Martin, 56, rose to fame in the ’90s as one of the greatest female boxers in American history, quickly winning over the country with her charisma and talent.

However, behind closed doors, the athlete was dealing with personal demons and a very toxic relationship with her manager, and later husband, Jim Martin.

Jim viciously stabbed and shot Christy in 2010 but the fighter survived to tell her story, which she was thrilled landed in Sweeney’s lap.

I think she is young, hot, talented and about to make a movie that in 20+ years, fathers will watch with their daughters to make them aware of domestic violence,” the former boxer told TMZ in May