Jamie-Lynn Sigler just revealed the gender of her baby ... via her nail color! Check out the photo below:

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The "Guys With Kids" star's blue Sally Hansen manicure spilled the beans: she's having a boy!

Despite playing a mom of two, the baby will be Jamie-Lynn's first. She's engaged to Cutter Dykstra, the son of MLB legend Lenny Dykstra.

Click on the "Launch Gallery" button above to see even more celebrity nail art, from a pro-skateboarder's surprising sparkly nails to Ke$ha's krazy manicures.

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