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Would Nicole Richie consider a stint on "Dancing with the Stars?"

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Richie, who gave birth to her son Sparrow in September, has debuted an impressively svelte post-baby physique. Her weight loss secret just might be dancing -- to Jay Z!

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Sunday, Richie, 28, boasted via Twitter, "I've lost 10lbs from dancing!!"

In a chant familiar to Jay-Z fans, she added, "H to the izzo. V to the izza!!" A subsequent Tweet ("I''m gonna need crutches tomorrow") showed a blurry photo of a concert stage.

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Indeed, Jay-Z performed (with surprise guest Rihanna) at L.A.'s Pauley Pavillion Sunday, with Justin Timberlake and girlfriend Jessica Biel also attending.

Sparrow is Richie's second child with partner Joel Madden; daughter Harlow is 21 months.