HOW THE F**K DOES SURI HAVE A BODY DOUBLE?

Suri Cruise is just six and has never made a movie, but she apparently already has the kind of accessory reserved for biggest stars — a body double.

And she can thank her security obsessed superstar dad Tom Cruise.

The News spotted Suri’s alleged double as recently as Friday afternoon, after her mom, actress Katie Holmes, picked her up from her Manhattan school and they returned to their Chelsea home.

They were trailed, as they always are, by photographers.

Hankering a snack, celebrity mother and daughter hopped back into a black SUV and headed downtown to TriBeCa, apparently bound for the 'wichcraft sandwich shop on Greenwich St., which is a favorite of Holmes.

But the vehicle made an unexpected stop at a police precinct — and out popped the doppelganger.

She wore the same purple, puffy down-filled coat as Suri.

She had the same black leggings and Ugg-type tan boots with pink soles as Suri.
And while she tried to hide her face, her auburn hair was long and brown like Suri’s.

Only she wasn’t Suri.

The real Suri arrived with her nanny minutes later in another black SUV at the side entrance of a TriBeCa building that leads to the eatery.

Wearing her favorite panda hat and carrying the stuffed toy that goes with her everywhere, the Holmes-Cruise spawn was whisked inside by her nanny before anybody noticed.

Almost anybody.

“I've seen this type of thing when stars have stalkers,” said an observer, who has done legwork for private eyes in the past.

Big shots faced with “kidnap threats” will resort to using body doubles.

“They go through private security because if they go to the police, it eventually hits the press and they don't want that,” the observer said.

The identity of Suri’s alleged double wasn’t immediately known and it’s not clear if her duties extend to being TomKat’s daughter’s playmate.

But the little imposter is apparently friendly with Holmes, who was photographed talking to her a month earlier.

Sources said Cruise, who divorced Katie last year but remains deeply involved in their daughter’s life, has a mania for security.

“Tom wants the names of all the parents of the kids Suri plays with,” said a source close to Holmes. “He has to approve them before Suri can go to their houses or apartments alone. He has them investigated and he keeps a file on everyone. He is very cautious when it comes to her.”

For reasons unclear, Cruise has stepped up security around Suri in recent months and has met with risk assessment teams and kidnapping specialists, sources said.

“They have talked with them specifically in relation to Suri and her well being,” a source said. “These guys deal with kidnap threats of families and children for super rich people and corporations. They work in high risk territories and targets around the world. They advise on how to best prevent subjects being placed in compromising situations, while offering protection solutions, too.”

Holmes shares her ex’s security concerns “as she is with her child for most of the week in New York under the terms of their divorce,” the source said.

“Their security is already tight, but keeping Suri away from possible dangerous or vulnerable situations remains the priority.”

It’s possible Cruise and Holmes were spooked by reports of a sick plot to kidnap, kill and castrate teen pop star Justin Bieber.

“So no threats of any nature can be ignored,” the source said.

Using body doubles is a long-accepted Hollywood practice, with even stunning leading ladies such as Keira Knightley, Jessica Alba and even Lindsay Lohan using stand-ins for steamy scenes that require showing some skin.

Even some male actors like Owen Wilson and Kevin Costner have resorted to doubles when a scene called for exposing their backsides.

But generally it’s been high-rollers and despots like Adolf Hitler, Joseph Stalin and Saddam Hussein who have relied on stand-ins.

During World War II, the Brits used a doppelganger for Gen. Bernard Montgomery to fool German spies.

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