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PIC: Jessica Simpson Gives First Glimpse of Post-Baby Bod

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Jessica Simpson leaving a gym in Los Angeles on June 12, 2012.

Go, Jessica, go!

Jessica Simpson isn't kidding about dropping the pounds gained during her very first pregnancy with daughter Maxwell Drew Johnson, now one-and-a-half months old.

On Tuesday, the 31-year-old Fashion Star mentor was once again spotted hitting a gym in Los Angeles — and this time, after the workout was done, photographers caught the very first glimpse of Simpson's shrinking post-baby figure.

Related: PHOTOS: A history of Jessica's bump

Heading back into a waiting SUV, Simpson (engaged to Maxwell's dad Eric Johnson) wore black leggings, tracksuit hoodie top and cross-trainers.

The singer and fashion mogul was first spotted hitting the private gym of celeb trainer Harley Pastermak (who has worked with Halle Berry, Hilary Duff and others) last week. The 5-foot-3 star told ELLE magazine that she weighed 170 pounds at the time of her iconic pregnant nude photo shoot for its April cover. After Maxwell's birth (the little girl weighed 9 lbs 13 oz), Simpson needed to heal from her C-section — and then it was back to the gym.

Related: PHOTOS: How she and Eric fell in love

An extra motivation: A $4 million deal with Weight Watchers.

Related: PHOTOS: Her fashion mishaps from the past

"She hasn't even thought about working out for a year!" a source told Us Weekly last month. "But if she wants this, she'll need to work out a good five days a week."

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