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Jamie Lynn Sigler

Dmac/FAMEFLYNET PICTURES

Jamie-Lynn Sigler's got some serious bling!

The pregnant Guys With Kids star showed off her engagement ring Thursday while shopping in Beverly Hills. Covering up her baby bump with a loose striped shirt, the 31-year-old mom-to-be proudly wore the dazzling diamond given to her by fiancé Cutter Dykstra.

But that wasn't all the mommy-to-be did to celebrate Valentine's Day! She also indulged in some pregnancy cravings.

"I couldn't decide between Oreo or cherry cheesecake from Cheesecake Factory," she tweeted. "so I got both!"

Well, she is eating for two!