"Real Housewives of Orange County"
star Tamra Barney sure knows how to party!

The reality star hit up The Palazzo in Las Vegas over the weekend with her fiance, Eddie Judge, costar Heather Dubrow and "Chelsea Lately" comedian Heather McDonald to celebrate the couple's joint bachelor and bachelorette parties.

The pair had some serious fun at the pool, with Eddie sporting chains around his arms, and a stuffed speedo with "Tamra's Toy" printed on the backside.

We can see why she's marrying him -- he's ripped!

Barney rocked a gold Victoria's Secret cover up and a black bikini as she posed for pictures with Eddie ... grabbing his sock-filled swimsuit and spanking his behind.

Heather Dubrow and Heather McDonald both gave shout outs to Tamra and Eddie at the pool, and shared their best wishes for the couple. The guests enjoyed Cuca Fresca Caiprinhas during the party.

Looks like Heather was the only "Housewife" at the pre-wedding festivities. Vicki Gunvalson was invited but had scheduled a vacation to Cabo with beau Brooks Ayers. Gretchen Rossi's absence seemed odd; perhaps it was because none of the "RHOC" cast was invited to her and fiance Slade Smiley's proposal party a few weeks ago. And of course we know there's no love lost between Tamra and Alexis Bellino.

Click "Launch Gallery" above to see all the wild party pics from their bachelor & bachelorette party!