Lauren Silverman

Mauceri/MacFarlane/; Ian Gavan/Getty Images

One look at Lauren Silverman on the red carpet, and it's hard to believe that she had a baby last month!

Lauren stepped out on the red carpet with husband Simon Cowell for the opening night of I Can't Sing at the London Palladium. It's her first red carpet appearance since the birth of her second son Eric on February 14, and we must say—she's looking very fit.

Lauren gained around 40 pounds during her pregnancy, the same she did during her first pregnancy with son Adam. A source tells E! News that she just recently started hitting the gym the past several days…and clearly it's paying off.

"You have to wait four weeks after delivery until you can exercise, so she only started up again this week," says a source close to Lauren. In addition to getting back into her workout routine, she's been cutting carbs from her diet. "She eats, she doesn't starve herself," says the insider. "She's very disciplined. It's little-to-no carbs and lots of protein."

Apparently Lauren used a similar discplined approach during her first pregnancy, and she lost all of the baby weight within the first two months. Pretty impressive! Posing on the red carpet, the 36-year-old mom looked fabulous in a form-fitting black dress that showed off her enviable post-baby body.

Clearly she's been sticking to a workout routine that works, but we'd say Lauren also has some awesome genes working for her, too.

—Reporting by Beth Sobol 

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