Great genes and… great jeans!

Kristin Cavallari gave birth only seven weeks ago and already the new mom has fitted right back into her skinny pants.

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The reality star welcomed baby son Camden on August 8 but showed she's back in amazing shape by wearing white jeans for a dinner date to Katsuya in Hollywood which showed off her physique to perfection.

The former star of The Hills and Laguna Beach added a black leather sleeveless top and black Christian Louboutin stilettos to her ensemble.

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Onlookers said Kristin looked radiant and couldn't stop smiling. When asked what advice she had for new moms out there she said, "Get your sleep now!"

Kristin has been tweeting about how hard she has been working out since giving birth.

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"Walking uphill on the treadmill to work out this booty," she wrote earlier this month. "Bye bye baby weight."

Kristin is engaged to her baby daddy, Chicago Bears quarterback Jay Cutler.

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