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    18 Famous People Who've Cheated On Their Partners And Then Straight-Up Admitted It

    Mario Lopez explained why he cheated on his bride-to-be at his own bachelor party.

    1. Kevin Hart admitted to the world that he cheated on his pregnant wife, calling it his "dumbest moment."

    Kevin Hart

    2. Mario Lopez admitted that he cheated on his ex-wife, Ali Landry, at his bachelor party just days before they got married.

    Mario Lopez

    3. Jessica Simpson revealed that she had an "emotional affair" with Johnny Knoxville while married to Nick Lachey.

    Jessica Simpson

    4. Jude Law made headlines for cheating on his then-fiancé, Sienna Miller, with his children's nanny.

    Jude Law in bow tie

    5. Kris Jenner revealed that her marriage to Robert Kardashian ended because she had an affair.

    Kris Jenner

    6. Arnold Schwarzenegger opened up about fathering a child with his housekeeper, behind his then-wife Maria Shriver's back.

    Arnold Schwarzenegger smiling amid a crowd

    7. Meg Ryan has admitted to dating Russell Crowe while she was still married to Dennis Quaid, but says people don't know the whole story.

    Meg Ryan

    8. Tiger Woods' marriage famously imploded after reports of multiple affairs.

    Tiger Woods wearing a cap

    9. Kristen Stewart issued a public apology to her then-boyfriend Robert Pattinson after she was photographed kissing director Rupert Sanders.

    Kristen Stewart

    10. Jay-Z cheated in his marriage to Beyoncé — which you certainly already know if you've ever heard Lemonade.

    Jay-Z in a suit and tie

    11. Katharine McPhee was photographed kissing her married Smash director, Michael Morris, while she was still married to Nick Cokas.

    Katharine McPhee

    12. Usher says he was "not faithful all the way" to his ex-wife, Tameka Foster.

    Usher

    13. Country star LeAnn Rimes and actor Eddie Cibrian had an affair when they were both married to other people. They eventually divorced and married each other.

    LeAnn Rimes and Eddie Cibrian

    14. Hugh Grant was arrested after being caught in a car with a sex worker in 1995, and wrote a public apology to his then-girlfriend, Elizabeth Hurley, the next morning.

    Hugh Grant with an open neck shirt and jacket, looking serious

    15. Lamar Odom says his "one ... regret" is cheating on Khloé Kardashian with multiple women.

    Lamar Odom on The View

    16. Sandra Bullock divorced Jesse James after he cheated on her with multiple women.

    Jesse James and Sandra Bullock

    17. Bones star David Boreanaz came forward about cheating on his wife after an alleged extortion attempt by his affair partner.

    David Boreanaz

    And finally...

    18. Tori Spelling and Dean McDermott had sex when they were both married to other people. They left those marriages and married each other, and then Dean cheated on Tori with yet another woman. Tori has acknowledged the irony of it all.

    Tori Spelling and Dean McDermott