This List of Celebs Who May Have Cheated On Their Famous Partners With Other Stars Will Break Your Heart

Not every Hollywood romance has a traditional beginning. Some of the biggest power couples in the industry started out with one of them acting as the other man or woman in a relationship — and the other, the cheating partner. It's not a pretty way for these couples to start out, but hey, at least some of them found lasting love, right? (And to the side of the triangle who was cheated on, we all know that you're way, waaaaay better off.) Click through to see the celebrities who allegedly cheated on other stars.

Brad Pitt Cheated On...

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Well, I think we all know how this story goes. But let’s ease ourselves into the infidelity, shall we?

Jennifer Aniston

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Pitt hooked up with this A-list actress on the set of their film Mr. & Mrs. Smith. Any guesses, friends?

...With Angelina Jolie

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Jolie and Pitt began dating shortly after shooting their espionage thriller in 2005, and Jolie recently admitted in an interview that the pair did, in fact, fall in love on set. Whether they actually hooked up behind Aniston’s back is an entirely different story, and the pair remains mum on the subject.

Kristen Stewart Cheated On...

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Stewart made a public apology for cheating on her boyfriend and Twilight co-star.

Robert Pattinson

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Bella and Edward were destined for one another, but Pattinson couldn’t get over Stewart’s affair with her director.

...With Rupert Sanders

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The married Snow White and the Huntsman director was spotted canoodling with Stewart in 2012. Though he, too, issued a public apology, his marriage never recovered, and his wife filed for divorce later that year.

James Cameron Cheated On...

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Jack and Rose weren’t the only ones who fell in love on the Titanic set — unfortunately, Cameron was already involved with this leading lady when he fell for someone new.

Linda Hamilton

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Hamilton and Cameron were living together when Cameron fell for this actress.

...With Suzy Amis

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You may remember Amis as Rose’s granddaughter in the iconic film, but Hamilton probably remembers her as the “other woman” in the relationship between her and Cameron. Cameron allegedly couldn’t pick between the two actresses — he was wed to Hamilton for eight months before leaving her for Amis, whom he now has three children with.

Megan Ryan Cheated On...

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America’s sweetheart has a love life right out of a romantic comedy. Or is it a drama?

Dennis Quaid

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Quaid and Ryan were married for nine years before the actress allegedly left him for her Proof of Life co-star in 2001.

...With Russell Crow

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The Les Miserables actor allegedly had a steamy affair with the married Ryan which resulted in the end of her marriage to Quaid.

Eddie Cibrian Cheated On...

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The actor wasn’t faithful to his reality star wife and the result was one highly publicized affair.

Brandi Glanville

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The Real Housewives of Beverly Hills star was shocked to learn that her husband had cheated on her with his Lifetime movie co-star.

...With Leann Rimes

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Rimes and Cibrian fell in love on the set of romantic Lifetime flick Northern Lights in 2008, while both were married to other people. The couple is now married and never misses a moment to trash talk Glanville — and, fittingly, the feeling is mutual.

Marilyn Manson Cheated On...

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The shock rocker and the burlesque dancer appeared to be the perfect match. Until, well, they weren’t.

Dita Von Teese

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Von Teese hinted in an interview that her rocky year-long marriage to the singer was made worse by his “inappropriate” relationship with a young actress.

...With Evan Rachel Wood

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Wood and Manson began dating in 2007, shortly after his marriage to Von Teese ended, making many wonder whether the 19-year-old was a factor in their breakup.

Billy Bob Thornton Cheated On...

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The Fargo actor wasted no time moving on from this actress with his Pushing Tin co-star.

Laura Dern

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As Dern puts it, she went away to work on a film and returned to find that her boyfriend had married someone else. She never heard from him again.

...With Angelina Jolie

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Jolie became Thornton’s fifth wife in 2000 and divorced three years later.

Justin Bieber Cheated On...

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If you believe all those rumors, then the Biebs hasn’t exactly been the most faithful boyfriend to this singer/actress.

Selena Gomez

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The “Heart Wants What It Wants” singer has had a rocky relationship with pop’s bad boy, but things came to a head when she heard rumors that he had hooked up with her pal.

...With Kendall Jenner

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Rumor has it that the model sent nude photos to her friend Gomez’s boyfriend while the pair were still together, prompting an immediate friendship ceasefire.

Claire Danes Cheated On...

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Danes and her co-star allegedly cheated on their own respective partners with one another before Danes romanced someone else behind his back.

Billy Crudup

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Crudup was expecting a child with Weeds actress Mary Louise Parker when he hooked up with Danes. Unfortunately, the couple’s rocky beginning may have been a bad omen, because she left him for yet another co-star.

...With Hugh Dancy

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Danes allegedly hooked up with Dancy behind Crudup’s back after three years together. The pair is now married with a child.

Chad Michael Murray Cheated On...

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Murray had to work with his ex-wife for years on their CW show, despite rumors of infidelity on his part.

Sophia Bush

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Brooke and Lucas didn’t work out on One Tree Hill, and neither did Bush and Murray, who wed in 2004. Why? According to rumors, it might have had to do with a certain blonde heiress…

...With Paris Hilton

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Murray and Hilton co-starred in House of Wax together and rumors swirled that they had an affair while on set. Whether or not that’s true, something made Bush angry enough to leave the marriage after a mere five months.

Joe Jonas Cheated On...

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Jonas should have known better than to do wrong by this songstress.

Taylor Swift

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Though it’s unclear as to whether Swift’s song “Better Than Revenge” is telling the truth about Jonas’ infidelity, Swift was none to happy that Jonas jumped into a relationship with this starlet after their breakup.

...With Camilla Belle

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According to the rumors — fueled by Swift herself — Jonas hooked up with Belle on set of the Jonas Brothers music video “Lovebug,” which starred the actress, when he was still very much with Swift.

Kanye West Cheated On...

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West’s ex-girlfriend has been vocal about the rapper’s infidelity.

Amber Rose

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Rose claimed that the reason for her split with the “Black Skinhead” rapper has a whole lot to do with this reality star.

...With Kim Kardashian

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Rose told Star Magazine that she found incriminating evidence that Kardashian and West were hooking up behind her back. Today Kardashian goes by Kardashian-West and is raising a baby with the rapper.