They’ve been having some serious marital problems, and now Heidi Montag and Spencer Pratt have accused each other of having extramarital affairs.

The “Hills” costars/real-life spouses are reaching a whole new depth of destruction, with Heidi going so far as to hire a private investigator to tail her hubby.

A gal pal revealed, “Heidi has hired a former member of the sheriff branch, who now works as a private investigator, to look into

it. It is really vital to Heidi to find out whether Spencer has been cheating on her.”

Meanwhile, Spencer is freaking out that Heidi has recently moved into his friend Cougar Zank’s Malibu home.

An insider told press, “They are definitely friends, and I don’t know whether there is anything more to it than that, but Spencer believes there is. He’s assured there is.”

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