A shaken Mary-Kate Olsen has stepped up security after receiving hate mail and death threats from angry fans of Heath Ledger. According to a recently published report, many fans of the late Oscar-nominated actor blame pint-sized Mary-Kate for the drug overdose that led to his death in January.

“A lot of people who knew Heath and Mary-Kate in his last months know that they were partying together constantly, it wasn’t hard to connect the dots and run a line between Heath hooking up with Mary-Kate and his sad decline,” a celebrity mole reveals in a new tabloid report.

“One crazed fan sent her threatening letters. Another made menacing phone calls,” according to a friend of the actress. “Mary-Kate’s gotten more reclusive, paranoid and afraid to walk the streets than ever.”

Playboy boss Hugh Hefner is hoping to convince the Olsen twins to celebrate their 22nd birthday in June by stripping off in the magazine. The media mogul has attempted to woo Mary-Kate and Ashley to disrobe in Playboy since they turned 18 – and he’s now launched a renewed bid to tempt them out of their clothes for a special celebratory photo shoot.

A source tells American magazine Star, “Hef thinks the twins are every young man’s fantasy.” But insiders insist the Olsens are holding out for a more classy magazine deal, telling Star, “They’re all about high-end fashion these days. They want to do Vogue.”

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What do you think of those glasses!

Actress and mini-mogul Mary-Kate Olsen has kept quiet about her battle with anorexia since she was diagnosed right after she turned 18, but she’s opening up about it now, saying that the illness almost killed her.

She says, “There have definitely been times in my life when I just turned to people and said, ‘I’m done – this is too much for me. This is too over-whelming.’”

Dealing with illnesses such as anorexia has to be hard to deal with in itself, but having to deal with alone has to be just terrible. We hope that she’s working through it now and doesn’t feel the pressure to be ultra-thin.

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Law enforcement officials are planning to ask Mary-Kate Olsen a few questions regarding her connection with the late actor, according to reports.

The masseuse, Diana Wolozin, who found Heath Ledger, made four telephone calls to Olsen prior to calling 911. While that’s not that out of the ordinary, according to police, they are seeking to interview Mary-Kate.

Police want to ask for her account of the phone calls that she received from Wolozin on Tuesday. A total of four calls were made to the star before emergency services were called.

They also plan on asking Olsen why she sent a security team of bodyguards to the apartment, instead of calling 911 herself.

The housekeeper, Teresa Solomon found Heath Ledger, face down on his bed. In an attempt to wake him for his appointment, they tried to rouse him, and when their efforts failed, that’s when Wolozin called Mary-Kate.

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

Police officials said that it’s not unusual for people to call relatives or friends in an emergency situation:

“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.”

UPDATE: According to TMZ, the police have said that they have no plans on questioning Mary-Kate Olsen.

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Certainly friends, definitely party pals and maybe more, Heath Ledger and Mary-Kate Olsen first met over the summer of 2006, at the time he was living at the Chateau Marmont in Hollywood, PEOPLE has learned.

More recently, “Mary-Kate and Heath were casually dating for three months before Heath’s death,” a source has told PEOPLE. “They were hooking up, but neither were particularly interested in making it exclusive.”

As for what drew the two together, says the source, “They had a bond that was based on partying, and they had the same tastes in partying … like, in terms of where they liked to hang out in New York, what time they would want to go out. They just had the same sensibility.”

At the time of their first becoming acquainted – the summer after Ledger’s Oscar nomination for Brokeback Mountain – Ledger and Olsen were spotted together having lunch at the Chateau with a group of friends, and Ledger was described as being charmed by Olsen, who made him laugh as he would scarf down a big meal.

“Mary-Kate made him laugh a lot,” an eyewitness recalled.

Both the New York Post and Daily News reported this week that Ledger, 28, and the Olsen twin, 21, were dating.

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Heath Ledger and Mary-Kate Olsen were dating, sources tell the New York Post and New York’s Daily News.

As reported, a masseuse who arrived at Ledger’s apartment Tuesday first called Olsen before 911 when she discovered the actor’s body.

Olsen’s number was programmed into Ledger’s phone, the Post claims.

According to the Daily News, Olsen’s bodyguard later confirmed to police that two were dating (though her rep says they’re just friends). The Post quotes a police source as saying the two had a “mutual relationship.”

According to a law enforcement official who spoke to the Post, the masseuse called Olsen first because “she didn’t want a media circus.” The Daily News reports that the masseuse called Olsen “for guidance.”

Olsen told the masseuse she would send her security guards to the downtown Manhattan apartment.

After the masseuse tried to rouse Ledger, she discovered that his body was cold, the Post reports, so she called Olsen again. “I think he’s dead,” she said.

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

The masseuse then told Olsen she was calling 911.

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