#1 Scott Disick and Kourtney Kardashian
Although they never married, Scott Disick and Kourtney Kardashian were together nearly a decade, having three beautiful children together. Their relationship always seemed rocky, but in the summer of 2015, the public speculated about an imminent split after the release of damaging tabloid photographs.
"The Lord" was caught cavorting with his ex-girlfriend Chloe Bartoli in Monte Carlo, and Kardashian confirmed their breakup days later.
#2 Eddie Cibrian and Brandi Glanville
Reality star Brandi Glanvilledoesn't hold back when it comes to revealing the details of her ex-husband's infidelity. When Brandi was taking care of their two young children,Eddie Cibrian began a flagrantaffair with his film costar Leann Rimes.
According to Glanville, he even had the gall to flirt with the country singer in front of her at a double date dinner. Years later, the costars are married and going strong, but the public remembers Eddie's philandering ways.
#3 Mario Lopez and Ali Landry
Days before his Mexico wedding to TV personality Ali Landry,Mario Lopez did the unthinkable. Instead of playing a round of golf, the formerSavedby the Bellstar cheated with a random chick on a booze-filled party weekend.
When hisbrunette bride found out via an incriminating photograph, their marriage was annulled two weeks later. Both celebs are now remarried, and Mario claims he's matured since the incident.
#4 Katherine McPhee and Michael Morris
Despite both being married, actress Katherine McPhee and her Smash director blatantly locked lips in the middle of Los Angeles back in 2013. In divorce documents, the American Idolalumna claims she was on a break from her then-husband Nick Cokas.
At the time, Michael Morris had 3 small children with actress Mary McCormack, and they reconciled shortly after the public make out. Katherine moved on to dating TV costar ElyesGabel.
#5 Ashton Kutcher and Demi Moore
People were skeptical of Ashton Kutcher and Demi Moore's marriage, citing their substantial 16 year age difference. But they proved the world wrong, staying together for nearly a decade until a cheating scandal rocked their relationship.
Rumors swirled that the two were separated for some time, but in 2011, a 22-year-old blonde claimed she had unprotected sex with Ashton. The high profile story was the icing on the cake, triggering the two to part ways for good.
#6 Jason Aldean and Brittany Kerr
Jason Aldean is a huge name in country music circles, but his dirty deeds back in 2012 really put him on the map! Gossip sites posted pictures of the singer getting cozy with a hot American Idol reject named Brittany Kerr.
The problem was, Jason was still married to his high school sweetheart Jessica Ussery, and they had 2 small children together. The couple eventually split, and Aldean went on to make an honest woman out of Brittany. The new Aldeans are now married and are considering expanding their family.
#7 Dean McDermott and Tori Spelling
Despite a popular reality show and four impressionable children at home, Dean McDermott's uncontrollable impulses couldn't be tamed. In 2013, he admitted to cheating on the Beverly Hills 90210 star with a 28-year-old who he met in a bar.
Following a weekend long affair, Dean returned to his family and begged for forgiveness. Fans can't say they didn't see it coming. Tori and Dean first got together when both were married back in 2005 on the set of Mind Over Murder.
#8 Jesse James and Sandra Bullock
America's sweetheart was on top of the world after winning the Academy Award for Best Actress for her role in The Blind Side. But behind the scenes, Sandra Bullock's adulterous husband was carrying on a number of affairs.
Perhaps the most famous mistress was tabloid chaser Michelle "Bombshell" McGee, a tattooed pinup vixen who publicly outed Jesse. Sandra divorced the TV personality shortly thereafter, and she went on to adopt a beautiful baby boy without him.
#9 Blake Shelton and Miranda Lambert
Blake Sheltonand Miranda Lambertmet while he was married, but the two couldn't deny their incredible attraction. The country singers were married after years of dating, but in 2015, gossip blogs reported trouble in paradise.
They've recently broken up, both accusing each other of infidelity. While the true details have yet to be revealed, Blake and Miranda definitely have some bitter divorce proceedings on the horizon.
#10 Josh Duhamel and Fergie
Not all celebrity marriages succumb to adultery! Back in 2009, Josh Duhamel stepped out on his talented wife with a stripper, almost ending their 9-month union.
Now, it's been over a decade since they first began dating, and Fergie and her actor husband are stronger than ever. With son Axl, the Hollywood couple continues to communicate, attend church, and work through their rocky past.
#11 Arnold Schwarzenegger and Maria Shriver
News of Governor Arnold's affair with live-in housekeeper Mildred Baena shocked the nation. The actor turned politician risked his marriage to the beautiful Maria Shriver, but the consequence of their rendezvous was even more appalling.
Schwarzenegger fathered a love child with the woman, admitting to young Joseph's existence in 2011. The power couple remain separated, and Arnold has expressed hopes of reconciliation.
#12 Hugh Grant and Elizabeth Hurley
Hugh Grant and Elizabeth Hurley weathered a severe storm during their 13 year relationship. In 1995, the British actor was arrested in Los Angeles after receiving illegal oral sex from prostitute Divine Brown
Astoundingly, Elizabeth stuck by him following the incident, and the lovebirds were together for 5 more years before splitting in 2000. They remain friends, and Hugh is godfather to the gorgeous actress's son.
#13 Robin Thicke and Paula Patton
Robin Thicke and Paula Patton were childhood sweethearts, dating for years before marrying in 2005. They almost made it to the 10 year mark, but Robin's rising stardom tested his fidelity.
The soul singer made little attempt to hide his sloppy, philandering ways, being photographed multiple times groping and canoodling with various women. Paula ditched him, and Robin responded with a number of failed public attempts at apology.
#14 Kobe Bryant and Vanessa Bryant
Kobe Bryant's wife stood by him when he was accused of sexual assault over a decade ago, so it's amazing to think he would dare betray her trust again. But in 2011, their divorce was imminent after Vanessa caught him cheating.
Fellow basketball wives gave her the tip, and with solid proof, she filed soon after. In a rare twist, the long-time couple announced they were calling off the split in 2013.
#15 Tiger Woods and Elin Nordegren
If you were alive in 2009, then there's no doubt you heard about Tiger Woods' incredible infidelity scandal.After a domestic fight in which Tiger crashed his Escalade in their Florida neighborhood, Elin Nordegren ditched her dirty husband when news broke of his numerous affairs.
The golf superstar thought he was invincible, carrying on sexual relations with as many as 120 women. Despite their 5-year marriage, the blonde beauty is better off without him.
#16 Prince Charles and Princess Diana
She was the world's princess, and he was her philandering prince. But over time, Diana and Charles' relationship was destroyed by affairs on both sides. The future king resumed a relationship with married ex-girlfriend Camilla Parker Bowles shortly after marrying his beautiful bride.
Experiencing depression over her failed union, Diana sought comfort in James Hewitt, her riding instructor. The royal mess was highly publicized before the Princess's untimely death in 1997. Charles is now married to his mistress.
#17 Jay Z and Beyonce
In 2014, a leaked surveillance tape from a NYC elevator left the world stunned, questioning the future of Beyonce and Jay Z's seemingly perfect union. Although no details have been confirmed, the incident showed Queen B's sister Solange wildly attacking Jay.
Reports speculate that the altercation was caused by the rapper's infidelity. We may never know the truth, but suggestion of the couple's cheating scandal was front page gossip for weeks.
#18 Jude Law and Sienna Miller
Talk about a love triangle! In the case of Jude Law and Sienna Miller, the serious couple actually engaged in a 4-way affair, with the British actress dating Daniel Craig and the actor starting up a relationship with the nanny.
Even a scandal of these proportions couldn't keep them apart. Sienna and Jude rekindled their romance a few years later,but split for good in 2009. The ridiculously good-looking duo are better off separate for the sake of their many children.
#19 Brad Pitt and Angelina Jolie
In an affair to end all affairs, the handsome Brad Pitt couldn't help but wander when tempted by the likes of Angelina Jolie. Although he was married to America's sweetheart Jennifer Aniston, Brad Pitt claims to have only "fell in love" with the temptress while filming on the set of Mr. and Mrs. Smith. Brangelina are still together and are raising their 6 children.
#20 Kristen Stewart and Rupert Sanders
Kristen Stewart was dating the hottest man alive, while director Rubert Sanders was a supposedly responsible adult with a wife and children at home. But these minor details didn't stop the two from carrying on a bizarre public affair in the summer of 2012.
