Wedding Drama! Tamra Barney Didn't Invite Gretchen Rossi To Her Nuptials Until The Very Last Minute

She promised before the wedding that "not all the Housewives will be invited," but Real Housewives of Orange County star Tamra Barney reversed her position at the very last minute, RadarOnline.com has learned.

Her on-again, off-again pal, Gretchen Rossi, didn't receive her invite to the nuptials at St. Regis Monarch Beach Resort in Dana Point, Calif., until the "eleventh hour," according to a show insider.

"Tamra and Gretchen have had a difficult relationship over the last few months and Tamra was insistent that Gretchen would not be there… not invited," a source said.

"But at the eleventh hour, she changed her mind. It was a change of heart. She realized just how important it was to have her there, despite all the petty drama."

Signs of just how deep their feud had become were revealed when Tamra had her joint bachelor-bachelorette party in Las Vegas during May; only RHOC costar Heather Dubrow attended the soiree, with Gretchen and Vicki Gunvalson sidelined.

Vicki ultimately made it into the bridal party, alongside Heather, however.

"Off-screen, Gretchen and Tamra definitely are not as close as they used to be," said the source.

"If the wedding was 12 months earlier, she would have been standing alongside Tamra at the altar as a member of the bridal party, but after all that has gone us, Gretchen just didn't make the cut."

In a recent blog post, Gretchen bemoaned how mother-of-four Tamra can be "very confusing and hurtful to friends."

Even Alexis Bellino, Tamra's arch-nemesis, was included on the guest list.

Not surprisingly, when it was announced that 44-year-old Tamra's wedding to third husband Eddie Judge, 40, was to be featured on a Bravo spin-off, the network promised to chronicle how she would maintain the "peace amongst her boisterous fellow Housewives."

The three-part series Tamra’s OC Wedding premieres Monday, September 2 at 8pm ET/PT.