When it comes to Hollywood, successful marriages are a dime a dozen. It's hard for couples to make their relationships work when they're traveling so much and when rumors surrounding their companionship are on the cover of every tabloid. Things get worse for couples when they have underlying issues in their relationship and have to work with stunning fellow actors and actresses who test their loyalty.

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Sadly, not every couple has the thick skin needed to last in the public eye. Thanks to sneaky paparazzi pictures and honest confessions, these 10 celebrities had horrific public breakups after affairs that happened on set with a co-star.

10 LeAnn Rimes & Eddie Cibrian

LeAnn Rimes and Eddie Cibrian were both big names in their own right. When the two teamed up for the movie Northern Lights, they were each married to their partners Brandi Glanville (of Real Housewives of Beverly Hills) and Dean Sheremet (a professional dancer).

However, it was clear their desire for each other was too strong and the pair left their spouses for each other. Restuarant footage caught LeAnn and Eddie secretly meeting up for drinks and food without their partners. And after the affair was announced, LeAnn's ex told ET exactly how he felt and how he knew deep down that things changed in their relationship.

9 Kristen Stewart & Rupert Sanders

Twilight fans remember this breakup all too well. After Kristen Stewart and Robert Pattinson fell in love while filming the Twilight saga, fans could practically hear wedding bells. The two were always together and lived together in California. However, when K-Stew was filming Snow White and the Huntsmanpaparazzi released images of Stewart and the director Rupert Sanders getting intimate.

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The two were hugging and kissing privately. The problem was Kristen was dating Rob and Rupert was a married father of two! Both publicly came out and apologized to their loved ones but both found themselves single at the end of it all.

8 Meg Ryan & Russel Crow

Meg Ryan was America's sweetheart in the '90s. She was super talented and was in a string of hit movies. At the time, she was in a highly publicized marriage with fellow Hollywood hottie, Dennis Quaid; they were the perfect couple. However, after filming the movie Proof of Life, it came out that Meg had an affair with her hunky co-star Russel Crow. Shortly after, Quaid filed for divorce. Meg and Crow began dating shortly after but the relationship didn't last long.

7 Claire Danes & Billy Crudup

Actress Claire Danes is a huge star and incredible actress but her decision making cast a downfall on her character back in 2003.

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Danes met actor Billy Crudup while filming Stage BeautyAt the time, Crudup wasn't just dating actress Mary-Louise Parker for eight years, she was carrying their child. But it was clear the bond between Danes and Crudup was too strong because he left his girlfriend to start dating Danes when she was seven months pregnant. Danes and Crudup went on to date for four years before breaking up. Danes has mentioned the affair to Howard Stern but Mary-Louise Parker and Billy Crudup have stayed relatively quiet about it all.

6 Debra Messing & Will Chase

Will & Grace sensation, Debra Messing, was married to producer Daniel Zelman for 16 years before officially divorcing. At first, it just seemed like another casualty of being married in the public eye but it later turned into a rumored affair that tore the marriage to shreds.

It's been reported that Messing was in a relationship with her Smash co-star Will Chase. Around the same time Debra filed for divorce from Daniel, Will filed for divorce from his wife Stephanie Gibson. According to The Daily Telegraph, the two began dating immediately, proving there was something between them all along. After dating for two years, however, the two called it quits.

5 Paris Hilton & Chad Michael Murray

Chad Michael Murray and Paris Hilton were iconic figures in the 2000s. Paris was the wealthy socialite that was photographed everywhere she went, and Murray became famous for One Tree Hill. The two ended up working together while filming House of Wax and were allegedly hooking up while he was married to co-star Sophia Bush. To add truth to the affair, Sophia tried annulling the marriage for "fraud" just under a year of marriage. But when that didn't work, she divorced Chad Michael Murray quickly. All three have stayed mum about what really happened.

4 Helena Bonham Carter & Kenneth Branagh

Kenneth Branagh was married to actress Emma Thompson for nearly six years before rumors started spreading. Back in the '90s, Branagh was filming Frankenstein with actress Helena Bonham Carter when the two began a secret relationship. Thompson found out, filed for divorce, and he and Helena dated for about five years before breaking up themselves.

Sadly, at the time Thompson felt betrayed by Helena, whom she knew and was friendly with. Thompson has since spoken about the affair and noted that the two women were on better terms now and that it was "blood under the bridge."

3 Jennifer Aniston & Justin Theroux

Everyone in the world of pop culture knows about the affair between Brad Pitt and Angelina Jolie while they were filming Mr. and Mrs. Smith. Poor Jennifer Aniston was left in the dust and had to deal with seeing the new power cover grace every magazine. What some people may not know is that Jennifer founder herself in a similar predicament with ex-husband Justin Theroux.

The two stars met while filming Wanderlust and began dating a few years later. However, at the time of the movie, Theroux was in a long-term relationship with Heidi Bivens. The two were together for 14 years before Theroux left her for Jennifer. This left people speculating if these two began their relationship while filming...

2 Angelina Jolie & Billy Bob Thornton

Angelina Jolie seems to have this hold on men and can't help herself when it comes to love. Long before she started her relationship with Brad Pitt, she was married to actor Billy Bob Thornton. The problem is, the two met while filming Pushing Tin when he was engaged to actress Laura Dern. It wasn't until Dern began hearing about their secret affair in the tabloids that she knew she lost her fiance. And it seems like Dern had zero closure.  As she said, "I left our home to work on a movie, and while I was away, my boyfriend got married, and I've never heard from him again." Jolie and Thornton were married for three years before divorcing.

1 Suzy Amis & James Cameron

Famed director James Cameron and his wife Suzy Amis have a complicated backstory. The two met while filming Titanic and fell head over heels for each other. The problem is that Cameron lived with his longterm girlfriend Linda Hamilton at the time. His relationship with Amis carried on while living with Hamilton but he had to make a choice. Marie Claire claimed he went on to marry Hamilton but later divorced her to get back together with Amis whom he's still married to today!

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