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Hollywood actor Eddie Cibrian denied cheating on his ex-wife, Brandi Glanville, after he was accused of having a sexual relationship with Piper Perabo.

This isn't the first time the former "Real Housewives of Beverly Hills" star has accused Cibrian of cheating.

Brandi Glanville and ex Eddie Cibrian

Brandi Glanville recently accused ex-husband Eddie Cibrian of having an affair with Piper Perabo in 2005. (Getty Images/File)

Despite Glanville's insistence that Cibrian was unfaithful in 2005 while filming "The Cave," the actor recently told Fox News Digital that it is 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."

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 an interview with Page Six. "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."

"He convinced me that it wasn’t true," she said. "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."

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

LeAnn Rimes and Eddie Cibrian married in 2011. (Kravitz/FilmMagic via Getty Images/File)

The actor went on to marry Rimes in 2011.

There have been many cheating scandals in Hollywood. Here's a look at some of the wildest among them:

Mike Caussin, Jana Kramer

Jana Kramer revealed that her ex-husband, NFL star Mike Caussin, cheated on her with more than 13 women.

Caussin and Kramer married in 2015. The two separated for a year in 2016 while the former tight end battled his sex addiction after the country music star learned of his infidelity. By December 2017, Caussin and Kramer had renewed their vows.

The two were married for nearly six years before Kramer filed for divorce on the grounds of infidelity in 2021.

Kramer claimed she "went real crazy" after finding out how many women Caussin had cheated with.

"I shattered so many things in my house," Kramer said during an episode of "Red Table Talk."

Mike Caussin and Jana Kramer on the red carpet

Jana Kramer opened up in an interview about ex-husband Mike Caussin's infidelity. (Amy Sussman/E! Entertainment/NBCU Photo Bank)

"I destroyed all of his Xboxes and all of those things he said was his only vice," she told the co-hosts. "I wrote all over his tux. I went real crazy for a minute."

Kramer also claimed that she felt like a "f---ing idiot" when she realized Caussin was still cheating on her after the two wrote a book about forgiveness titled "The Good Fight: Wanting to Leave, Choosing to Stay, and the Powerful Practice for Loving Faithfully."

Adam Levine, Behati Prinsloo

Adam Levine found himself in the middle of a cheating scandal shortly after announcing he was expecting his third child with wife Behati Prinsloo.

Multiple women came forward, accusing Levine of sending flirtatious text messages. Instagram model Sumner Stroh was the first to speak out, claiming she had a year-long affair with the musician.

Prinsloo has not publicly commented on the allegations made by the women or indicated that she is seeking to divorce Levine. In fact, they were spotted together looking very happy in Montecito, California, shortly after the news broke.

ADAM LEVINE DID NOT HAVE A PHYSICAL RELATIONSHIP WITH SUMNER STROH OR OTHER ACCUSERS: SOURCE

Adam Levine and his pregnant wife, Behati Prinsloo

Adam Levine and his pregnant wife, Behati Prinsloo, are shown in Montecito, California. (Garrett Press/ MEGA for Fox News Digital/File)

Fox News Digital spoke to legal experts to understand exactly what counts as "cheating" in a court of law. Legal expert Katherine Miller explained that cheating is mostly defined in the legal world as sexual intercourse.

"Adultery generally requires sexual intercourse. And even that is not a game-changer in most divorce cases, unless money has been spent on the extra-marital relationship, in which case the other spouse may be entitled to compensation," said Miller, founder of New York City-based Miller Law Group.

"There may be a separate tort claim for alienation of affections against the third party in some states if the level of flirtation in the communications rises to the level of interference with the marital relationship."

New York divorce attorney Sandra Radna further explained to Fox News Digital that adultery is not grounds for divorce in California, and screenshots of text messages or DMs would not be "useful" if Levine's wife were to decide to file for divorce.

"[Messages] may be considered emotional cheating, which is not grounds for divorce but may lead to a lack of trust which, in turn, may lead to the breakup of a marriage (through irreconcilable differences,)" Radna said.

The Maroon 5 frontman has maintained that he did not have an affair but did acknowledge that he "crossed the line."

"He maintains that none of these interactions became physical," a source close to Levine told Fox News Digital.

"Whatever your definition, when a spouse cheats, it is heartbreaking and often humiliating, and it may cause the end of the marriage," Miller told Fox News Digital.

Arnold Schwarzenegger, Maria Shriver

Arnold Schwarzenegger and Maria Shriver pose for a photo

Arnold Schwarzenegger fathered a child with his mistress the same year he welcomed his youngest son with Maria Shriver. (Vladimir Rys/Bongarts/Getty Images/File)

While married to Maria Shriver, Arnold Schwarzenegger carried on an affair with the couple's housekeeper, Mildred Baena. The affair did not come to light until 14 years later, when the movie star confessed during a therapy session after leaving his position as the governor of California.

As he told "60 Minutes," that was when he revealed that he was the father of Baena's son, Joseph. Schwarzenegger's son with Baena was born days after his youngest son with Shriver, Christopher, in 1997.

Tom Brady, Bridget Moynahan

Tom Brady and Gisele along with Bridget Moynahan

Tom Brady, photographed with wife Gisele Bündchen, left. He was previously in a relationship with Bridget Moynahan, right. (Getty/File)

While it is unclear if Tom Brady ever technically cheated on Bridget Moynahan with ex-wife Gisele Bündchen, he did break up with the actress while she was pregnant with his first child.

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Moynahan and Brady broke up in December 2006, and the football star quickly struck up a relationship with supermodel Bündchen that same month. However, the "Sex and the City" star publicly announced that she was pregnant with Brady's first child in February 2007.

Moynahan welcomed a baby boy in August 2007.

Tristan Thompson, Khloe Kardashian

Khloe Kardashian and Tristan Thompson welcomed True in 2018

Tristan Thompson has cheated on Khloe Kardshian multiple times, including during her pregnancy in 2018. More recently, the basketball star fathered a child with another woman while he was beginning the surrogacy process with Kardashian. (Jerritt Clark)

Tristan Thompson originally made headlines after video surfaced of the basketball star holding hands with another woman just days before Khloe Kardashian gave birth to their first child, True, in 2018.

Thompson made headlines again when he cheated on Kardashian after the two had rekindled their relationship. The Good American founder did not find out about the cheating until the other woman filed legal documents claiming Thompson was the father of her unborn child.

Maralee Nichols gave birth to her son months after the basketball star and Kardashian had begun a surrogacy process. Kardashian and Thompson welcomed their second child via surrogacy in early August.

KHLOE KARDASHIAN SHARES PHOTOS OF HER SON AND DAUGHTER, TRUE, IN NEW CHRISTMAS PHOTOS

The reality TV star addressed the paternity scandal and her surrogacy process on "The Kardashians."

"There is something I'm ready to talk about," Khloe said in a preview of the season 2 premiere. "Tristan and I are having another baby."

"And it's supposed to be a really exciting time, it's just a different experience."

Future, Ciara

Future and Ciara on the red carpet

Future reportedly cheated on Ciara while she was pregnant with their daughter. (Getty Images/File)

Future and Ciara had a whirlwind romance before it abruptly ended over cheating allegations. The rapper and musician first announced their relationship in 2013 and shortly after became engaged.

By January 2014, Ciara revealed she was pregnant with the couple's first child.

However, shortly after giving birth, the two called it quits, and rumors surfaced that Future had cheated on her during her pregnancy.

The rapper responded to the allegations at the time by saying, "I don't respond to rumors, I respond to money."

Hank Baskett, Kendra Wilkinson

TV personality Kendra Wilkinson and Philadelphia Eagles NFL wide receiver Hank Baskett arrive at the 2010 ESPY Awards

Kendra Wilkinson was eight months pregnant when Hank Baskett had a sex scandal involving a transgender model. (Reuters/File)

Years before reality star Kendra Wikinson filed for divorce from Hank Baskett, the former couple endured a dramatic cheating scandal.

While Wilkinson was eight months pregnant, Baskett reportedly had an affair with a transgender model in 2014.

"I messed up," Baskett told People magazine in an interview. "I put myself in a bad situation. And everything through me brought pain upon this family."

Eddie Murphy, Mel B

Eddie Murphy on the red carpet

Eddie Murphy reportedly walked out on Mel B while she was pregnant with their daughter. (Getty)

Eddie Murphy famously left his relationship with Spice Girls star Mel B while she was five months pregnant.

The former couple met in 2006 and began dating before Mel B became pregnant. However, following her split from Murphy, the comedian claimed he was not the father. A paternity test later confirmed he was.

Mel B most recently asked Murphy for more in child support in 2020, according to legal documents obtained by Us Weekly.

François-Henri Pinault, Salma Hayek

Francois Henri-Pinault, Salma Hayek

French billionaire Francois-Henri Pinault fathered a child with Linda Evangelista the same year Salma Hayek became pregnant with their daughter. (Andreas Rentz/Getty Images)

In 2006, French luxury brand owner François-Henri Pinault got his then-girlfriend Salma Hayek pregnant and also fathered a child with Linda Evangelista while he was briefly split from Hayek.

By late 2006, Hayek was also pregnant and gave birth to the couple's daughter.

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Evangelista chose to keep her child's father a secret until she appeared in court in 2011 over the custody agreement.

Pinault and Hayek married on Valentine's Day in 2009.