Ben Affleck may have done it. Josh Duggar definitely did it.
Tristan Thompson did it to his pregnant girlfriend.
And Tiger Woods also did it, over and over and over and over again.
Infidelity scandals have rocked an endless number of famous relationships, crossing the boundaries of sports, music, movies and television.
Let's take a look below at some of the most memorably shocking celebrity cheating instances of all-time:
Tristan Thompson (with Many Women!)
The most damning report concerning Thompson is, yes, that he cheated multiple times on Khloe Kardashian. But he allegedly did so just over a week before she gave birth to their child! My goodness!
Kristen Stewart (with Rupert Sanders)
It remains incredible to this day: Kristen Stewart cheated on Robert Pattinson with director Rupert Sanders, as photos of their affair hit the tabloids and Stewart issued a public statement regarding the incident.
Ben Affleck (with Christine Ouzounian)
Celebrity gossip outlets everywhere have had to memorize the spelling of Christine Ouzounian's name because Affleck allegedly stuck his penis in the vagina of his family's nanny prior to divorcing Jennifer Garner.
Josh Duggar (with Danica Dillon... and others)
Josh Duggar has been outed as a child molester AND as a cheater husband, following his admission that he was a client of Ashley Madison for many months.
Hank Baskett (with Ava London)
Hank Baskett swears a transgender model only touched his private parts OVER the shorts. But this cheating scandal has fueled numerous reality TV seasons.
Tiger Woods (with, like, everyone)
Tiger Woods was married to quite the stunner in Elin Nordegren. He then went out and banged like every cocktail waitress he saw.
Mario Singer (with Kasey Dexter)
Mario Singer and Ramona Singer's 22-year marriage ended after the former had an affair with a much younger woman.
Scott Disick (with Chloe Bartoli)
Scott Disick says he did not cheat on Kourtney Kardashian with Chloe Bartoli in the south of France. But his actions were enough for Kourtney to finally kick him to the curb.
Jesse James (with Michelle McGee)
"I cheated on my wife. Guess what? So do millions of other men," James told Men's Journal in May 2011 of how he treated Sandra Bullock. "To be honest, it was unfair for me to even be in a relationship."
David Letterman (with Stephanie Birkitt)
David Letterman admitted to the world, on air, that he slept with at least one member of The Late Show staff, beating a blackmailer to this embarrassing punch.
LeAnn Rimes (with Eddie Cibrian)
LeAnn Rimes cheated on her husband with Eddie Cibrian while filming a Lifetime movie. He also cheated on his wife with the singer... and then these two got married.
John Edwards (with Rielle Hunter)
John Edwards is no longer a Presidential candidate. That's because he slept with videographer Rielle Hunter... and fathered her child out of wedlock while running for the White House! And while his wife Elizabeth was dying of cancer!
David Boreanaz (with Rachel Uchitel)
David Boreanaz has something in common with Tiger Woods ... both have slept with Rachel Uchitel! But the Bones star remains married (to Jamie Bergman, pictured).
Hugh Grant (with Divine Brown)
Hugh Grant was in a serious relationship with Elizabeth Hurley when he paid $40 to get a blow job from a hooker.
Jude Law (with Daisy Wright)
Jude Law cheated on Sienna Miller with their nanny back in 2006. Incredibly, the couple reconciled briefly even after this affair came out.
Bill Clinton (with Monica Lewinsky)
Bill Clinton DID have sexual relations with "that woman" while serving as leader of the free world. Don't ask about that cigar.
Peter Cook (with Diana Bianchi)
Peter Cook cheated on Christie Brinkley with a 19-year old. Christie Brinkley! What the heck, dude?!?
Anthony Weiner (with random Internet people)
Yes, Anthony Weiner "only" sent photos of his penis to women on the Internet. But think of how you'd react if your husband did this.
Arnold Schwarzenegger (with Mildred Baena)
Arnold Schwarzenegger fathered a child out of wedlock with his housekeeper. And he was married to Maria Shriver at the time! What an idiot.
Ashton Kutcher (with Sara Leal)
A young woman named Sara Leal documented how she slept with Ashton Kutcher in a hot tub. A few months later, the actor's marriage to Demi Moore was over.
Dean McDermott (with Emily Goodhand)
Dean McDermott cheated on his wife with Tori Spelling. He then cheated on Tori Spelling with Emily Goodhand.
Tony Parker (with Erin Berry)
Tony Parker allegedly stepped out on Eva Longoria (Eva Longoria!) with the wife of his ex-teammate. Not cool, dude.
Woody Allen (with Soon-Yi Previn)
Woody Allen cheated on Mia Farrow with her step-daughter, Soon-Yi Previn. Yikes! The two are still an item.
Kobe Bryant (with hotel employee)
Kobe Bryant was accused of rape by an employee at a Colorado hotel in 2003. He admitted to the affair and the charge was eventually dropped.
Brad Pitt (with Angelina Jolie)
If Brad Pitt did not cheat on Jennifer Aniston, he at least had an emotional affair with Angelina Jolie. This scandal is STILL talked about, despite everyone involved having moved on a very long time ago.
Jason Aldean (with Brittany Kerr)
Jason Aldean is now divorced. That's what happens when you get caught (on camera) kissing American Idol alum Brittany Kerr.