The show will center around the 45-year-old's summer wedding to fiancé Eddie Judge, 40.
Filming for the as-yet-unnamed program began at the weekend when Barney and Judge enjoyed his-and-her bachelor and bachelorette parties at The Palazzo in Las Vegas, a source close to the production revealed.
"Tamra is the perfect choice for the next Housewife to get her own show," the insider told Radar.
"She joined the cast in series three and has become one of the veterans of the series and is incredibly popular with Housewives fans.
"For Bravo, she has it all: the romantic storyline of getting married, for a third time, the drama with the other OC Housewives and she'll inevitably be a beautiful bride, when she walks down the aisle."
That drama was apparent while in Las Vegas, as we first reported: Only costar Heather Dubrow attended the soiree, with on-again, off-again pals Vicki Gunvalson and Gretchen Rossi conspicuous in their absence.
In an interview in May, the twice-married reality star revealed she and Judge plan on having two weddings.
"We're thinking about maybe going to Mexico with the kids and our parents… and then coming home and having a big fabulous wedding for hundreds of people," Barney said.
But she added, the pair doesn't want it to be too "over-the-top."
"Me and Eddie are very simple people and we don't need all the frills and fancy, so I'm hoping it's going to stay small and intimate with a lot of love," she said. "That's all I want -- a lot of love."
Bravo had no comment about the spin-off, though a network insider said it had not yet been decided the length of the spin-off, or if it would be a one-off special.
"Expect a formal announcement soon," the source said.
Barney split from her ex-husband Simon after season five of filming; he cited infidelity and disloyalty by Barney in the divorce.
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