Vicki Gunvalson ADMITS to telling a 'couple of lies' as her angry RHOC co-stars confront her over Brooks Ayers' 'fake' cancer in explosive reunion preview

The finale episode of season 10 left more questions than answers.

And in a glimpse of the upcoming first installment of the reunion show, the ladies of Real Housewives of Orange County hash it out in front of Bravo cameras with reliably dramatic results.

Vicki Gunvalson, whose ex-boyfriend Brooks Ayers has been accused of faking his cancer diagnosis throughout the last series, receives the brunt of the ladies' criticism as they continue to poke holes in her story.

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On the defense: The cast of Real Housewives of Orange County fire accusations at Vicki Gunvalson in a sneak peek of the reunion episode which will air on Monday

On the defense: The cast of Real Housewives of Orange County fire accusations at Vicki Gunvalson in a sneak peek of the reunion episode which will air on Monday

In a heated exchange, Heather Dubrow declares: 'He's not sick, we're all agreeing on this. The only question to me is, when did you find out?'

Vicki, 53, is seen defending herself again, insisting: 'I don't have proof he's not faking cancer and I don't have proof he is.'

'I do,' Shannon Beador quickly snapped. 

Hashing it out: The ladies come together for the first of a three-part reunion series to talk about the explosive season 10 of the reality show

Hashing it out: The ladies come together for the first of a three-part reunion series to talk about the explosive season 10 of the reality show

Enough: Vicki, 53, refuses to say anything more about her ex's illness and claims she doesn't have proof either way of whether he lied

Enough: Vicki, 53, refuses to say anything more about her ex's illness and claims she doesn't have proof either way of whether he lied

In another explosive part of the clip, host Andy Cohen shocks the rest of the cast when he says to Vicki: 'You admitted that you've fabricated the story. What else...' leaving fans guessing as to what she revealed.

The mother-of-two is seen having her make-up done before the showdown where she says 'I haven't lied about anything - well maybe a couple of lies' 

Later, Tamra Judge has a heart-to-heart with Vicki as she says of Brooks 'I knew he was a piece of s**t from the day you started dating him.'

Final confirmation? Shannon Beador comes forward to claim she has proof that Brooks Ayers faked his cancer diagnosis

Final confirmation? Shannon Beador comes forward to claim she has proof that Brooks Ayers faked his cancer diagnosis

Fired up: Heather Dubrow jumps into the debate saying 'He's not sick, we're all agreeing on this. The only question to me is, when did you find out?'

Fired up: Heather Dubrow jumps into the debate saying 'He's not sick, we're all agreeing on this. The only question to me is, when did you find out?'

Transformation: Meghan King Edmonds shows off her new brunette look as she is seen getting ready for cameras

Transformation: Meghan King Edmonds shows off her new brunette look as she is seen getting ready for cameras

Meghan King Edmonds, 31, tells cameras 'I don't know what to expect but I'm just going to go out there and be myself I guess' as she sits having her newly brunette locks styled.

Meanwhile, the cast talk about Shannon's marriage strife as Cohen asks her 'Did David ever tell you why he had an affair?

'I was complaining and nagging' Shannon replied to which an outraged Heather responded: 'That's bulls**t - that's not your fault. You fix it or you leave. You don't cheat.'

Marriage trouble: Shannon tells host Andy Cohen that her husband cheated on her because she was 'complaining and nagging' which Heather called 'bulls**t'

Marriage trouble: Shannon tells host Andy Cohen that her husband cheated on her because she was 'complaining and nagging' which Heather called 'bulls**t'

The ladies also get to watch a pre-recorded interview where Brooks finally gets to have his say.

In the brief snippet shown, the businessman accuses Vicki's daughter of lying so she can 'manipulate' to which an infuriated Briana reacts to with two middle fingers and a 'f**k you' angled at the cameras.

The Real Housewives of Orange County season 10 reunion starts Monday October 19 at 9pm. 

Confession? In a separate pre-recorded interview Brooks gets to have his say and fires back at Vicki's daughter saying she told lies to manipulate

Confession? In a separate pre-recorded interview Brooks gets to have his say and fires back at Vicki's daughter saying she told lies to manipulate

'She's dead and here you are trying to say he has cancer!' Meghan King Edmonds burst into tears when she talked about her husband's ex-wife LeAnn who recently lost her life to cancer

'She's dead and here you are trying to say he has cancer!' Meghan King Edmonds burst into tears when she talked about her husband's ex-wife LeAnn who recently lost her life to cancer

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