'RHOC' Star Shannon Beador Opens Up About Confronting Her Husband's Former Mistress

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The Real Housewives of Orange County star Shannon Beador dished to ET about her run-in with husband David's former mistress, Nicole McMackin, over the weekend.

"I was shocked to see that she was there, so this time, I'm not going to roll over," Shannon shared. "I said, 'You have a lot of nerve being here!'"

WATCH: 'RHOC' Star Shannon Beador Has Run-In With Husband David's Mistress at USC Game

The incident took place at the USC vs. University of Utah college football game at the Los Angeles Memorial Coliseum on Saturday. Both Shannon and Nicole's husbands are USC alumni, and through "an unfortunate coincidence," according to an eyewitness, the two couples were seated only about 15 rows apart.

"I found myself in front of the stands and I yelled, 'This is the woman who had an affair with my husband!'" Shannon recalled.

Their confrontation was preceded by an encounter in the tunnel during halftime, during which Shannon said to Nicole, "You have a lot of nerve being here Nicole." Nicole then got in Shannon's face and said, "F**k you, you are crazy."  

Shannon also posted on Instagram about the encounter, writing, "Someone with no moral compass decided to show up again."

While Shannon admitted that it's normal for Nicole and her husband, Reed, to attend home games, she seems most upset by their proximity to her family.

"They could buy a seat anywhere," she said.

WATCH: 'RHOC' Happy Hour With Shannon Beador

David's cheating scandal first came to light on an episode of RHOC that aired in June. In the episode, it was revealed that he cheated on Shannon with Nicole for eight months and even left her at one point.

"I don't think that people understand the level of hurt," Shannon said on a RHOC reunion show earlier this month. "When David left me for those two weeks, he would still come and pick the kids up from school. One day he handed [our daughter] Stella his wedding ring, and said, 'Give this to your mother. I don't want it anymore.' That was a knife in my heart. I thought, 'We're never going to get back together.'"

During the football game confrontation, Shannon reportedly yelled at Nicole, "Wait until Monday. Wait until Monday. The press will be all over you again -- you just wait."

WATCH: 'RHOC' Star Shannon Beador Reveals Husband David Left Her During Affair

This reported statement was in reference to part two of the RHOC reunion show that airs tonight on Bravo.

"It's a recap and I answer some questions," Shannon told ET.

The Real Housewives of Orange County "Reunion Part Two" airs Monday at 9 p.m. ET/PT on Bravo.