LONDON - Meghan Markle has her heart set on becoming Diana 2.0, according to a new biography that details her lifelong embrace of good causes but also points to a calculating streak. The "Suits" star, who is set to marry on May 19 this year, is fiercely protective and sidelines people as she moves ahead in life, according to people cited in the book.

"Meghan: A Hollywood Princess," which is due out in Britain on Thursday, details how the 36-year-old US actor ditched her first husband.

The biography is authored by Andrew Morton, the British royal writer who penned the blockbuster "Diana: Her True Story."

He also details Markle’s fascination with Prince Harry’s mother Diana around the time of her death in 1997, watching her funeral in tears.

Family friends said she was intrigued by Diana “not just for her style but for her independent humanitarian mission, seeing her as a role model”.

Her childhood friend Ninaki Priddy is cited as saying, “She was always fascinated by the royal family. She wants to be princess Diana 2.0.”

Morton says comparisons with Diana are inevitable, given her humanitarian work and glamorous appeal.

However, he notes the crucial distinction between the timid Diana, who married Prince Charles at 20, and the Hollywood professional. “In some ways, the groomed and camera-ready Ms Markle was the woman Diana always strove to become,” he wrote.

The book also claims that as she finally found success as an actor Markle shed her old acquaintances - including her film producer husband Trevor Engelson.

“Her friends in Los Angeles noticed the change in her now that she was on the way up,” Morton wrote. “She no longer had the time for friends she had known for years. A networker to her fingertips, she seemed to be carefully recalibrating her life, forging new friendships with those who could burnish and develop her career.”

Markle had been with Engelson since 2004 and they married in Jamaica in 2011. Shortly after their engagement, she landed her signature role as Rachel Zane in the US legal drama television series "Suits."

Filmed in Toronto, their relationship became long-distance as she became a star. The marriage collapsed in 2013. - AFP