Beyoncé is showing off her post-baby body in the latest issue of Shape magazine.

The 31-year-old megastar opens up about how she shed the 57 pounds she gained while pregnant with daughter, Blue Ivy.

"I didn't have a lot of time to lose the weight, because I scheduled a show three months after I gave birth, which I would never do again," Beyoncé says in a one-minute-and-a-half, behind-the-scenes video of her Shape shoot.

"I'm not a person that is naturally very thin. I am a person that has to work at keeping my body in shape,” she adds.

A strict diet and exercise regimen is key. Shape Editor-at-Large Bahar Takhtehchian said in May that Beyoncé combined cardio, lunges, and a diet full of veggies and lean meat to lose the baby weight.

Dancing also helps Beyoncé keep the weight off; she's known for her elaborate performances at concerts.

In February, Beyonce’s personal trainer, Marco Borges, spoke to Life & Style magazine about how he helped whip the mom in shape. Borges said he put her on a partially vegan diet, with “one vegan meal a day, because this typically gets people to eat more greens than they normally would."

He added,  "Consistency is the key to success. I love running-sprint intervals for quick cardio sessions and also ... running stairs."

Although Beyoncé’s weight loss is impressive, she says in the shoot for Shape that it isn't necessary to be stressed if you aren't the exact size as the women in the media.

"Not everyone is supposed to be the same. Be healthy and take care of yourself, but be happy with the beautiful things that make you, you."

Watch her behind-the-scenes video for Shape below: