Megan Fox has been spotted doing re-shoots for her upcoming Teenage Mutant Ninja Turtles movie in Los Angeles.

Megan Fox Films 'TMNT'

Fox, who gave birth to her second son with husband Brian Austin Green just seven weeks ago, looked fit while running on the set of Teenage Mutant Ninja Turtles. The 27-year-old actress appeared to have dropped all her baby weight in her skinny jeans, scooped-neck t-shirt and leather jacket.

In the action flick, Fox plays April O’Neil alongside Will Arnett as Vernon Fenwick. Playing the titular crime-fighting turtles are Alan Ritchson (Raphael), Noel Fisher (Michelangelo), Jeremy Howard (Donatello) and Pete Ploszek (Leonardo).

"She's a kick-ass April," Arnett told IGN of Fox. "Megan did such a great job. There are some great sequences that she has and that we both have together that are really high octane where we're fighting all sorts of bad dudes."

Teenage Mutant Ninja Turtles, produced by Michael Bay and directed by Jonathan Liebesman, is slated to hit theaters Aug. 8, 2014.

– Chelsea Regan