Princess Anne's royal life is the subject of the new ITV documentary Princess Royal: Anne at 70. The film will air in the U.K. ahead of Anne's 70th birthday, which falls on August 15.

Princess Royal will explore in detail Anne's family, her famous work ethic, and her life going back to the 1960s and '70s—an era when she was a three-time Vogue cover star. The princess cooperated with the production of the film, which reportedly spent time with her for about one year.

Princess Anne to speak "frankly" on kidnapping attempt

According to an ITV press release, in the film, Anne gives interviews and is expected to speak "frankly" on subjects including the failed 1974 kidnapping attempt on her and then-husband Mark Phillips.

The young couple was fortunate to escape unharmed after a gunman opened fire and intercepted their car upon its return to Buckingham Palace. Anne, who was 23 years old at the time, reportedly said "not bloody likely" when the kidnapper told her to get out of the vehicle.

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Princess Royal will further touch on Anne's unique accomplishments as the only daughter of Queen Elizabeth II and Prince Philip. "She was the first daughter of a monarch to go to school, the first royal Olympian and the first child of a monarch to insist her children were called 'Mr,' and 'Miss'," the press release adds.

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Princess Anne's family and work life to feature in royal documentary

Likewise, the film provides insight into the soon-to-be 70-year-old's impressive work ethic and charity efforts. "Her Ladies in Waiting admit that they struggle to keep up with her relentless pace while her charities reveal a passionate patron who keeps everyone on their toes," ITV said.

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The Oxford Films production also delves into previously unseen family footage, depicting Princess Anne's domestic life as never seen before. "[Viewers] will also see and hear how she relaxes with her children, her grandchildren and her animals at her Gloucestershire estate while Sir Tim reflects on a shared love of the sea and much else," the release adds.

The air date for the film about "a Princess who refused to follow the script" is not yet confirmed by ITV, but it will debut prior to August 15, the Princess Royal's 70th birthday.