OK! Exclusive: Get The Skinny On Ashlee Simpson’s ‘Grueling’ Post-Baby Workouts

Ashlee Simpson is wasting no time getting her post-baby body back! Although she only had her baby girl Jagger just weeks ago, the singer is already working on getting her body back into shape.

A source told OKMagazine.com that Ashlee has already begun a “grueling” post-baby workout against experts’ advice!

“Ashlee’s really going for it and has started the most grueling post-baby workout, despite her doctor telling her to wait at least four weeks,” the insider said.

According to her pal, she’s in the gym twice a day for an hour each time and only takes one day off, but still finds time to be active on her rest days. “Even then she’s in the pool or makes sure she does a yoga class,” the source said.

“She’s determined to be back to her normal shape by the end of next month, when Evan’s planning to take her away for a tropical vacation for her birthday,” the source said.