Celebrities who've been caught cheating -

Faithfulness is important in any relationship, famous or not. And when it comes to fans, they're certainly invested in the love lives of their favorite celebrities.

That's why people don't want to believe that Justin Timberlake actually cheated on Jessica Biel. While he's not admitting he did, his public apology after recently cozying up with co-star Alisha Wainwright is raising eyebrows.

What do you think? Will JT be joining this list of the celebs who had a weak moment (or two) and were caught cheating on their partner?

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Tristan Thompson - Tristan Thompson and Khloé Kardashian split up because the basketball player allegedly cheated on her with Kylie Jenner's then-best friend, Jordyn Woods.

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Donald Trump - Donald Trump was already married to Melania Trump when he reportedly had an affair with former adult movie star Stormy Daniels.

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Jay-Z - After rumors spread, Jay-Z finally went public and opened up to David Letterman about cheating on Beyoncé.

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Kevin Hart - Kevin Hart admitted to cheating on his wife, Eniko Parrish, while she was pregnant.

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Morena Baccarin - Morena Baccarin was married to Austin Chick when she had an affair with her current husband, actor Benjamin McKenzie.

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Offset - Offset has reportedly cheated on Cardi B with a number of different women. Despite this, however, the two are back together.

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Nick Young - Security cameras caught basketball player Nick Young cheating on then-fiancée Iggy Azalea. She told Andy Cohen on 'Watch What Happens Live' that she set fire to his clothes after finding out.

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Kristen Stewart - In 2012, Kristen Stewart was caught cheating on Robert Pattinson with film director Rupert Sanders. He was married at the time.

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David Letterman - Letterman cheated on Regina Lasko with his assistant, Stephanie Birkitt. He made a public apology on-air. 

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Tiger Woods - Golf player Tiger Woods admitted that he cheated on his wife and had an affair.

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Brad Pitt - Brad Pitt was still married to Jennifer Aniston when he started a relationship with Angelina Jolie.

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Kris Jenner - The socialite already confessed that she had cheated on her husband, Robert Kardashian.

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Arnold Schwarzenegger - In 2011, it became public that Schwarzenegger had a teenage son from a maid, with whom he had an affair for years.

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Jennifer Lopez - Dancer Chris Judd's father said in an interview that the singer started cheating on his son with Ben Affleck five months after the wedding.

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Usher - Usher allegedly cheated on ex-wife Grace Miguel, and numerous people accused the star of giving them herpes while the two were together.

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Britney Spears - The pop star reportedly cheated on Justin Timberlake with her choreographer Wade Robson.

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Woody Allen - Mia Farrow found out that Woody Allen was cheating on her with her adopted daughter, Soon-Yi.

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Paris Hilton - Chad Michael Murray and Paris Hilton had a relationship while she was dating Nick Carter. Chad Michael Murray was also married at the time to Sophia Bush. 

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Tim Burton - In 2013, Tim Burton was photographed kissing a woman other than his wife Helena Bonham Carter.

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Heidi Klum - Heidi Klum's marriage with Seal ended amongst accusations that she cheated on him with her bodyguard.

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Tori Spelling - Tori Spelling was married to Charlie Shanian when she had an affair with Dean McDermott, who was also married at the time. Spelling and McDermott later married each other.

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Kobe Bryant - The basketball legend admitted to having cheated on his wife and having sex with another woman.

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Hugh Grant - The actor was arrested in 1995 after being caught with a prostitute in his car. Shortly after, his eight-year relationship with Elizabeth Hurley ended.

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Ashton Kutcher - In 2013, Ashton Kutcher cheated on his then-wife, Demi Moore, with a woman named Sara Leal.

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Meg Ryan - In 2000, Meg Ryan was caught cheating with Russell Crowe. Soon after she ended her marriage to Dennis Quaid.

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Kevin Federline - Federline reportedly cheated on his then-girlfriend to get together with Britney Spears. 

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Billy Bob Thornton - Billy Bob Thornton and Laura Dern were still dating when he got married to Angelina Jolie.

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Billy Crudup - Billy Crudup had an affair with Claire Danes when his then-girlfriend, Mary-Louise Parker, was pregnant.

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Elizabeth Taylor - In 1963, Elizabeth Taylor had an affair with Richard Burton. She was married to Eddie Fisher at the time, who had left Debbie Reynolds to be with Taylor!

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Ethan Hawke - Ethan Hawke was married to Uma Thurman when he had an affair with a babysitter.

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Jude Law - Another celebrity who had an affair with a babysitter, Jude Law was dating Sienna Miller when he had an affair with the nanny.

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Jack Nicholson - In 1989, Jack Nicholson cheated on his girlfriend Anjelica Huston with Rebecca Broussard, who became pregnant.

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Josh Duhamel - Duhamel allegedly sought the services of a stripper named Nicole Forrester while dating Fergie.

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Larry King - Larry King was married to Shawn Southwick, who was 26 years younger than him, and ended up having an affair with her sister.

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Ryan Phillippe -

The actor was caught kissing Abbie Cornish while he was married to Reese Witherspoon. The pair later divorced.

See also: The best and worst films of Reese Witherspoon.

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