Simon Cowell -- Sex Criminal!!! ... Allegedly

Simon Cowell may have committed a crime in addition to a bro sin by allegedly banging his good friend's wife ... because that, our friends, is considered CRIMINAL ADULTERY!

Who knew ... but we did some digging and found a New York law making homewrecking a criminal misdemeanor, punishable by up to 3 months in jail.

As we reported ... real estate mogul Andrew Silverman filed divorce docs in NYC, alleging his wife Lauren and Simon committed adultery during his marriage and made a love child. She's 10 weeks pregnant.