The book, written by Andrew Morton alleges that Jolie betrayed mom Marcheline Bertrand, when she was just 16 years old.

British writer Andrew Morton, 57, has earlier written biographies of Princess Diana, Monica Lewinsky and Tom Cruise.

Morton's publisher St Martin's Press has announced that the sale of the unauthorised biography, 'Angelina', will start from August 3 under an "extremely tight embargo."

The 'Now' magazine has also reported that Angelina then struggled to rebuild her relationship with her mother, who died of cancer in 2007, after confessing to a night of passion with her boyfriend.

"Marcheline had a live-in boyfriend whom she was very much in love with, but Ange slept with him when she was 16 and barely out of school," a source has been quoted.

"Her mother found out and ended her relationship with the man. When Ange admitted the story to her brother James just a few weeks ago, even he turned on her.

She has hardly anyone left in life who likes or trusts her." Angelina was devastated by the death of her mother, who was only 56 years old when.

She succumbed to cancer, and is reportedly attempting to reconcile with her father, Jon Voight. Jolie's representatives declined to comment on the story.