The Expendables 4 star appeared in the first snap with short dark brown hair cropped above her shoulders ... matching her make-up look. Related: Megan Fox Rocks 'Diamond' Tears to Machine Gun ...

Her hairstylist calls it the "cowgirl bob." Megan Fox has really been keeping us on our toes in the hair color department. After spending a couple months with bubblegum pink hair early this year ...