Jessica Simpson is working hard to get rid of her post-baby body weight as she was seen Tuesday hitting the gym in Los Angeles.

The Fashion Star mentor was hitting a private gym with celebrity trainer, Harley Pastermak, when paparazzi captured the first picture of her since the birth of one-and-a-half month old Maxwell Drew Johnson.

The 5-foot-3 fashion mogul told ELLE that she weighed 170 pounds at the time of their April shoot.

She is currently back in the gym and working hard after healing from her C-section and we’re sure the $4 million from Weight Watchers is also helping with her motivation.