Sean “Diddy” Combs reportedly “kept meticulous records” of his infamous parties, and “has enough dirt to hang half of Hollywood,” according to a source, who added that well-known celebrities are pa nicking while they “pray he keeps his mouth shut.”

The disgraced music mogul’s ex-girlfriends — including singer Jennifer Lopez and actress Cameron Diaz — are in a major pa nic that he will drag them down by revealing unsavory secrets about them if he ends up going away to prison, a source told In Touch Weekly.

“It’s not like they’ve been going around trashing him, but everyone’s been giving him a seriously wide berth,” the source told the magazine. “He’s radioactive at this point, even if he hasn’t been found guilty, his name is mud, and it would social su icide to have anything to do with him.”

The source added that Combs — who has been in jail since September 16 while he awaits trial for s e x trafficking, among a litany of other alleged crimes — expects his former friends to come to his defense, but nobody is, as they don’t want to r isk their reputations.

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“There’s a legitimate fe ar among a huge swath of people in Hollywood — J. Lo and Cameron included — that he could seriously embarrass them if he decides to talk about what they shared with him back in the day, which was pretty intimate,”

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the music mogul is also facing at least 120 separate lawsuits brought by Buzbee Law Firm and AVA Law Group on behalf alleged victims who are accusing Combs of a laundry list of crimes.

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“The names we’re going to name, assuming our investigators confirm and corroborate what we’ve been told, are names that will sho ck you,” Buzbee said.