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MARY-KATE ON THE HOT SEAT

Cops are planning to grill Heath Ledger’s pint-size paramour, Mary-Kate Olsen, about frantic phone calls she received from the masseuse who found him dead in his bed, The Post has learned.

It also emerged yesterday that the masseuse, Diane Lee Wolozin, had phoned Olsen four times using the “Brokeback Mountain” star’s cellphone – three before she even considered calling 911, police said.

Emergency workers arrived about 23 minutes after Wolozin first discov ered Ledger unresponsive in his bedroom near opened packages of pre scription pills, sources said.

Police investigators say they plan to inter view Olsen – who so far has said nothing publicly about her rela tionship with troubled star.

It was not clear whether she would fly to New York for the talk or if they would conduct the interview via a telephone call to California, where she has been holed up since the tragedy.

Cops planned to ask for her account of the cellphone calls she received from Ledger’s SoHo apartment, a source said.

The four calls were made during a nine-minute lag – before anyone thought to call 911.

Police also intended to ask Olsen, 21, why she sent a team of bodyguards to the apartment.

Wolozin, 40, telephoned Olsen after she and the actor’s housekeeper, Teresa Solomon, found Ledger face down on his bed. They had gone into his bedroom after he failed to respond to cellphone calls.

They were trying to rouse him for a scheduled massage appointment.

“Heath is unconscious. I don’t know what to do!” Wolozin screamed in her first call to Olsen, cops said.

Olsen replied, “I’m sending my private security there.”

Wolozin called Olsen again after finding Ledger was cold to the touch, and told the “Full House” star she was calling 911.

“I think he may be dead,” a shaken Wolozin said.

Olsen replied, “I already have people coming over.”

In all, police said Wolozin made three brief calls to Olsen between 3:17 p.m. and 3:24 p.m. She called 911 at 3:26 p.m.

Wolozin phoned Olsen again at 3:34 p.m., a minute after paramedics arrived. Olsen’s security guards arrived at about the same time.

It was unclear why Wolozin called the actress before dialing 911, why Olsen didn’t advise Wolozin to make the call for help, or why Solomon didn’t place the 911 call before the calls went out to Olsen.

Olsen’s spokeswoman did not respond to several requests for comment. An attorney for Olsen had no immediate comment.

Cops – who believe Ledger had been dead for up to two hours before Wolozin found him – said they did not find any illegal drugs at the scene.

However, authorities did find near his body several opened foil packs of pills, which were among the six sleeping and anti-anxiety medications prescribed in his name.

Law-enforcement sources last night said they did not think there was anything suspicious about either Wolozin’s or Olsen’s conduct.

“We have no problem with her calling [Olsen before 911],” one source said.

“This happens with everyday people, they call relatives [during emergencies] before they call 911 all the time.

“Maybe [Wolozin] panicked, because he’s a celebrity. She was afraid.”

Those sources also pointed out that there was not a big gap in time before Wolozin found Ledger and when she called 911.

When emergency workers arrived, they found Wolozin attempting cardiopulmonary resuscitation on Ledger under instruction from a 911 dispatcher.

Another source said Olsen’s security guards, who already have been interviewed by cops, “answered every question.”

“There was never anytime when those security guards were left alone” in the apartment, the source noted, pointing out that the EMTs, firefighters and cops all were at the scene.

The cause of Ledger’s death – which was followed by reports that he had been abusing illegal drugs in the past year – was still unknown yesterday as authorities awaited the results of toxicological tests.

At the time of his death, the actor was said to have been exhausted and jet lagged.

He had flown to New York from London last weekend after wrapping up shooting scenes in England for a movie, “The Imaginarium of Doctor Parnassus.”

Additional reporting by Austin Fenner, Sandra Hurley, Lorena Mongelli and John Mazor

jamie.schram@nypost.com