Jessica Simpson hits the gym hard to lose post-baby pounds; New mom spotted working out with celeb trainer - New York Daily News

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New mother Jessica Simpson is spotted leaving the gym after a workout in West Hollywood, California on June 11, 2012. Jessica is trying to whip herself back into her pre-baby body shape...

She’s got blond ambition!

Jessica Simpson is getting serious losing those post-baby pounds.

A little over a month after giving birth to daughter Maxwell Drew, the 31 year-old entrepreneur and “Fashion Star” host has been spotted working out with celebrity trainer Harley Pasternak at a private gym in Los Angeles.

CELEB BODIES AFTER BABY

Simpson, wearing black workout clothes and dark sunglasses, hopped into a black SUV after her workout.  She then covered herself with her signature leopard print jacket.

For the past nine months, she celebrated her pregnancy with buttered Pop Tarts, Kraft macaroni and cheese, brownies and chocolate chip cookie dough and tweeted about her love of Cap’n Crunch.

She even posed nude for Elle magazine, showing off her pregnant body in all its glory.

But now she’s dedicated to getting back into fighting shape.

"I think anybody who's gone through a pregnancy, after they have the baby, it's like, 'I need to do something about this,' " she told People magazine. "For me, I really want to do something that is a lifestyle, because in the past, I've been known to yo-yo diet."

Simpson, who reportedly gained 80 pounds during her pregnancy, had to put off getting back to the gym due to doctor’s orders -- the star had her daughter via C-section.

The American College of Obstetricians and Gynecologists recommends that new moms who’ve undergone a cesarean section wait approximately six t oeight weeke before resuming exercise or check with their doctor.

Pasternak, who has worked with celebrities like Jennifer Anision and Megan Fox, is likely taking care to make sure that Simpson warms up and cools down carefully, drinks plenty of fluids and avoids excessive fatigue.

He’s also likely checking in with her to make sure she isn’t feeling any pain where she had the incision.

Simpson plenty of allies in her quest to get back in shape.

Besides her husband, former NFL-er Eric Johnson, she’s is also being paid $4 million be the next spokesperson for Weight Watchers.

"I had a great pregnancy. Eating and not having to worry too much about it has been fun. Taking a break from working out has definitely been fun,” she told UsMagazine back in March. “But I'm ready for it to be over. I'm ready to have my body back!"