VIDEO : UFC's Paige VanZant -- I Was a Child Star ... In Cheesy Mop Commercial!

Before UFC stud Paige VanZant mopped the floor with the competition ... she mopped the floor with actual mops -- for her role in a cheesy TV commercial.
TMZ Sports spoke with the undefeated UFC phenom ... who revealed she was a child actor back in the day -- and actually scored a lead role for a Bissell steam mop ad.
Paige says she'd love to do even MORE commercials in the future, but could damaging her face in the Octagon be an issue???