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Kyle Richards
held a 200-person holiday party over the weekend -- where stars from the Orange County, Atlanta and Beverly Hills "Real Housewives" casts all mingled at the same bash!

Kyle, Camille Grammer, Lisa Vanderpump, Nene Leakes, Gretchen Rossi, Dana Wilkey and fellow Bravo reality show star Patti Stanger ("Millionaire Matchmaker") were all spotted at the event, held at Richards' Beverly Hills home.

It looked like a pretty great party -- where the ladies all posed for photos together in matching Santa hats.

While no punches were thrown (we think), former enemies Kyle and Camille also posed together with boxing gloves on.

Check out more photos from the party above!

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