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Former "Real Housewives of Beverly Hills" star Brandi Glanville went after Piper Perabo for having an alleged affair with her ex-husband, Eddie Cibrian.

However, Cibrian tells Fox News Digital Glanville's claims are "untrue."

"I’m sad I have to address this, I really believed that we had come a long way, but this was untrue 19 years ago and it’s untrue now," he said in a statement. "Just because someone thinks something might be true does not make it true. This is all so unnecessary. Fun times at the Christmas table await."

Glanville accused Cibrian of having a sexual relationship with Perabo while filming "The Cave" in 2005 in a new interview.

"They did a movie together, and [my son] Mason was 1 year old and I went to the set, and it was in another country, Romania, I think," she told Page Six. "And [Perabo] was a horrible c--t to me."

Brandi Glanville and ex Eddie Cibrian

Brandi Glanville, left, claimed that her ex-husband, Eddie Cibrian, had an affair with Piper Perabo in 2005. (Getty Images/File)

Eddie Cibrian and Brandi Glanville smile for a photo

Eddie Cibrian and Brandi Glanville got married in 2001. (Getty Images/File)

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Eddie Cibrian and Piper Perabo

Eddie Cibrian and Piper Perabo starred together in "The Cave" in 2005. (Getty Images/File)

The reality TV star said that while she was on set to visit Cibrian, Perabo flirted with her husband.

"She was flirting with Eddie, like, right in front of me," Glanville further claimed in the interview. "I was like, ‘Am I here? Am I the only person [seeing this]? Like, what is happening?’"

"I made friends on set and I heard a lot of things," she explained, adding that crew members informed her "that Piper and Eddie were f---ing."

Glanville said she confronted Cibrian, but he denied anything happened.

Brani Glanville on 'Watch What Happens Live."

Brandi Glanville claimed Eddie Cibrian said he hadn't cheated. (Peter Kramer/Bravo/NBCU Photo Bank via Getty Images/File)

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"He convinced me that it wasn’t true," she told the outlet. "We had a 1-year-old son, and he was the love of my life at the time and, you know, there was a lot of convincing me of things."

Representatives for  Perabo did not immediately respond to Fox News Digital's requests for comment.

Cibrian also allegedly had affairs with Scheana Shay from "Vanderpump Rules" and LeAnn Rimes. The actor's relationship with the country music star led Glanville and Cibrian to call it quits for good.

LeAnn Rimes and Eddie Cibrian

Eddie Cibrian married LeAnn Rimes in 2011 after the two allegedly had an affair while he was married to Brandi Glanville. (Jeff Kravitz/FilmMagic via Getty Images)

Cibrian went on to marry Rimes in 2011.

Cibrian and Glanville met at a club in the 1990s, according to multiple reports. The couple was married from 2001 until 2010. They welcomed their first son in 2003 and their second in 2007.

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