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.

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.

Now that Suri, is 6, Holmes reportedly wants to take her as far away from Cruise’s Scientology pals as possible.

Holmes, who was born in Ohio and raised Catholic, is seeking full custody so that Suri can be shielded from alleged Scientology brainwashing, sources said.

“Suri is at the age where they are going to start educating her in Scientology centers and indoctrinating her into the religion,” Holmes’ pal said.

“Katie did convert when she and Tom were married, but she didn’t take to [Scientology]. Behind closed doors, and when the private planes and the red carpets were gone, she didn’t like it. And she decided she does not want that for Suri. ”

Holmes had been planning her marital escape for weeks, surreptitiously moving with Suri into the Chelsea apartment while Cruise was out of the country.

The box-office superstar Cruise was spotted working on the set of his movie “Oblivion” yesterday in Iceland.

Holmes told her neighbor she was afraid he’d charter a plane to get back to New York.

“[Holmes] did not want that much influence and power and control [from the Church of Scientology] over her child and didn’t want to go through with” her education in it, according to Holmes’ friend.

“She was not going to let that happen to her daughter. Katie does not want them making all the decisions for her child,” the source said.

Cruise’s first two wives, Mimi Rogers and Nicole Kidman, reportedly also had problems with the church’s hold on their then-husband.

Another former Hollywood wife, actress-photographer Carmen Llewellyn, who was married to “My Name is Earl” actor Jason Lee — a Scientologist — has said the reprisals are swift and brutal against spouses who leave mates who are in the church.

“I lost my manager and my career,” Llewellyn said in a published interview after her split from Lee. “People didn’t return my phone calls.

“Scientologists followed me down the street. They took pictures of my kids. They’d stake out my house, wait until we came our and follow us. They came looking for me to scare me.”

Cruise, who turns 50 tomorrow, and Holmes, 33, were married on Nov. 18, 2006, in a lavish Italian ceremony.

Holmes reportedly signed a prenuptial deal that will give her $3 million for each year of marriage, meaning she could walk away with a cool $15 million — and a mansion in Santa Barbara County, Calif.

Additional reporting by David K. Li