Nicole Kidman kept some of the placenta from a miscarriage to prove that Tom Cruise was the father of her unborn child, the author of a controversial new biography claims.

British journalist Andrew Morton, whose book about Tom Cruise has sparked a $100 million legal threat from the Church of Scientology, spoke in detail about the actor’s relationship with Kidman in an exclusive interview with A Current Affair.

"They did try to start a family [but] she sadly had a miscarriage," said Morton. "And because of all the questions over the father, she ordered that some of the placenta be saved in order to prove paternity — the fact that Tom Cruise was the father."

Morton, 54, said the couple then decided to adopt, sparking rumours that Cruise was gay and the marriage was just a facade.

The author goes on to describe Kidman’s alleged plan to give up acting and "become a nun", as well as the effect Cruise has had on his new wife, Katie Holmes.

"Those who saw [Katie] were shocked about how changed she was," he said.

"Before she met Tom she was a kind of exuberant sparkly eyed girl and [after the marriage] they described her as being 'dead-eyed Katie' and they saw the transformation and it's not me who is saying it, but people who interviewed her who say that she looks like a Stepford Wife — that she is robotic."

Tom Cruise: An Unauthorised Biography has been released in the United States but will not be published in several countries, including Australia and the UK, due to stricter defamation laws and a legal threat from the Church of Scientology.

"Publishers find that it is not really worth it," said Morton.

The Church of Scientology has responded to Morton’s book with a 15-page statement, calling it "a bigoted, defamatory assault replete with lies."

Morton has also written books about Princess Diana, David and Victoria "Posh Spice" Beckham, Madonna and Monica Lewinsky.
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