The mother-of-two posted two Instagram photos of herself posing in a little black dress with fringe along the sleeves and black heels.
In one pic she strikes a pose, showing off her muscular gams. In another she’s on her knees in front of a Christmas tree.
Simpson credits Weight Watchers and celebrity trainer Harvey Pasternak for her slimmed-down bod.
Teri Ann Krefting, one of Pasternak’s trainers, told People that they usually work with Simpson 4 or 5 times per week for about 45 minutes.
"We usually alternate between doing quads one day and hamstrings and glutes or butt the next, and then inner thighs," Krefting said.