The actress was spotted on the set of "Teenage Mutant Ninja Turtles 2" at Grand Central Station on Tuesday in New York City, where she looked nearly unrecognizable sporting a short blonde wig.
Fox completed her look with a black pencil skirt, white blouse, black jacket and black leggings -- maybe April O'Neil has to go incognito in the sequel?
Earlier this week, the 28-year-old's costar Stephen Amell (Casey Jones) was also spotted on set sporting a buzzed 'do and a hockey stick in his hand.
There was also another exciting casting announcement made on Monday -- Brian Tee will take over the role of Shredder, who was previously played by Tohoru Masamune in the first flick.
Tyler Perry likewise joins the film as Baxter Stockman, Alessandra Ambrosio is reportedly playing a new love interest for Will Arnett's character Vernon Fenwick and mutants Bebop and Rocksteady are set to appear as well.
What do you think of Fox's "TMNT 2" makeunder? Tell toofab in the comment section below and check out the gallery above to see more stars' who've changed their looks for a role!