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Demi dumped Ashton over Paterno tweet: report

It wasn’t the cheating — it was the tweeting.

Demi Moore decided to give her straying younger hubby the heave-ho after he tweeted his support for former Penn State coach Joe Paterno last week, it was reported yesterday.

“How do you fire Jo Pa? #insult #noclass as a hawkeye fan I find it in poor taste,” Kutcher tweeted to his more than 8 million followers, unaware that Paterno had been fired for failing to tell cops that one of his assistant coaches had allegedly molested boys.

PHOTOS: DEMI MOORE

Kutcher recanted the tweet, but the damage was already done, a source on the set of Kutcher’s TV show told Bonnie Fuller’s Hollywood Life Web site.

“It was another thing to get Demi upset.

She believed he really didn’t care about the details of things, and the embarrassment of that reminded her of the embarrassment he caused her with the cheating,” the source said.