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Travolta claims a paramedic and a former Bahamian senator demanded $25 million to keep quiet about a ''refusal to transport'' document the star signed after his son Jett's fatal seizure last January. A trial is under way.
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In 2006, the talk-show queen sicced the FBI on a man who wanted $1.5 million to bury taped phone calls that he claimed contained damaging information about Winfrey. Feds dismissed the charges in exchange for community service and a fine.
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Cruise called authorities in 2007 when two men demanded $1.3 million in exchange for stolen photos of the star's wedding to Katie Holmes. One man was fined and sentenced to probation. The other hung himself after pleading guilty.
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Seminude photos from her modeling days came back to haunt Diaz when a photographer forged the star's signature on a release form and tried to extort $3 million to keep the pictures private. He was sentenced to four years behind bars.
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A woman who claimed to be Cosby's illegitimate daughter was sentenced to 26 months in jail in 1997 after she asked for $40 million to keep the story out of the tabloids (Cosby refutes her claim).
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In 2008, Lowe wrote a blog entry on The Huffington Post claiming that his former nanny, Jessica Gibson, had threatened to badmouth the actor and his family to the tabloids unless he paid her $1.5 million. Lowe sued for defamation; Gibson countersued for sexual harassment. Both suits were later dismissed at the request of Lowe and Gibson.