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.