'RHOC' Enemies! Kelly Dodd ‘Not Buying’ Vicki’s ‘Lies’ About Ex-Husband Hookup

What happens in Vegas, doesn’t always stay in Vegas!

Last week, The Real Housewives of Orange County star Kelly Dodd, 42, slammed former best friend Vicki Gunvalson, 56, on Twitter – claiming that she and boyfriend Steve Lodge betrayed her by intentionally setting up ex-husband Michael, 60, with one of their mutual friends while on a recent vacation to Sin City.

And now, after Gunvalson denied any wrongdoing, RadarOnline.com has exclusively learned that Dodd went ballistic on-camera – and it will all play out on the upcoming season 13 of RHOC!

“Vicki has tried doing everything she can to back pedal on this one, and she insist that she did not purposely try to set Michael up with her and Steve’s mutual friend,” a source close to Dodd said.

“She told Kelly that the hookup happened organically while they were on vacation, and that she didn’t mean to hurt her at all.”

But Dodd still isn't buying her former bestie's story, the source claims.

“Kelly obviously thinks that Vicki is full of s**t and so does the rest of the cast. Vicki was supposed to be her friend, and now Kelly just thinks that she is nothing but a backstabbing b****h,” the insider told RadarOnline.com.

“But Kelly is moving on from this and is not going to waste any more time worrying about her ex-husband — and ex-friend!”

However, as fans know, Gunvalson does not take kindly to being called a liar by one of her co-stars, and she's not begging for her friend back.

“Vicki isn’t even trying to kiss Kelly’s a** at this point because she really believes that she did not do anything wrong,” a source close to Gunvalson told RadarOnline.com.