She’s a prisoner in her own home.

Katie Holmes fears she can’t take one step without a Scientology goon following her every move in a heavy- handed intimidation attempt, multiple sources close to the actress told The Post yesterday.

The pretty actress last night was holed up in her Chelsea pad — terrified that soon-to-be-ex-hubby Tom Cruise might kidnap their little girl, law-enforcement sources said.

Holmes told another building resident of her abduction fear — and that neighbor called police on Friday, sources said.

READ: Katie's lawyer dad helped her escape.

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But without Holmes phoning in the report herself — and Cruise known to be 2,600 miles away shooting a movie in Iceland — police couldn’t take any action.

Managers at Holmes’ plush Seventh Avenue building, though, have been put on alert for Cruise or any strangers who might want to get inside, the sources said.

Holmes, who filed for divorce from superstar Scientologist actor Cruise last week, knew this was coming, the sources said.

“Katie saw all the pressure. They [Scientologists] are professionals at pressuring people to be quiet,” said a friend of the actress after her bombshell divorce filing in Manhattan last week. “That’s why she did this [filed for divorce] in secret.”

A team of beefy armed men parked themselves in a white Cadillac Escalade outside Holmes’ place all day yesterday, snapping pictures of people outside the building and demanding to know who they were.

Cops finally pulled up in a marked NYPD squad car behind the SUV and checked out its Tennessee license plates. The officers said they were acting on complaints of “suspicious activity in a white Escalade” but did not elaborate. They spent about 15 minutes eyeing the SUV before leaving. At least two of the five men sitting in the SUV were clearly packing heat. When asked who they worked for, one wisecracked: “We’re waiting for a bus.”

A Holmes rep said the mystery men weren’t with the actress.

Cruise’s team denied the guards were working for the actor. A Scientology lawyer told TMZ the church is not tailing Holmes.

The actress and her daughter, Suri, were not seen in public all day yesterday.

Go to The Post for more.

