Alyssa Milano turns 40: Inside her surprise birthday party!

Alyssa Milano's husband, David Bugliari, turned back the hands of time to celebrate the "Charmed" actress' 40th birthday!

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CAA agent Bugliari threw his wife a surprise party at The London West Hollywood in Los Angeles, Calif., on Dec. 14, multiple sources tell Us Weekly exclusively. "It's prom-themed because Alyssa didn't have a prom, and hers would have been in 1990s," one insider reveals of the former child star. "Everybody dressed up and everyone got a corsage when they walked in."

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Several of Milano's famous friends -- including Ludacris, Ken Jeong and Brian Grazer -- joined in on the fun. As DJ Vicious-Lee played Milano's favorite hits, guests were able to take prom-style portraits in a photo booth.

"Everyone had a great time!" a source tells Us of the star-studded soiree. "Alyssa was really surprised. She had no clue!"

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Milano, whose actual birthday isn't until Dec. 19, married Bugliari in August 2009 after a two-year courtship. They are parents to son Milo, 15 months.

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