In a new documentary about her life and relationship with her mother, fellow actress Debbie Reynolds, 84, Carrie reveals how the makers of the new Star Wars movie hired a fitness guru to weigh her, change her diet and cajole her into undertaking exercise.

The revealing film premiered on Sunday (15May16) at the Cannes Film Festival and showed footage of the personal trainer removing unhealthy junk food and drink from her home and put the 59-year-old star through her paces on a cross trainer.

According to Britain's Daily Telegraph newspaper, the actress, who played rebel leader Princess Leia Organa in the original science-fiction trilogy and The Force Awakens, mutinied against the strict regime by buying cans of cola and refusing to perform lunge exercises.

"They make them report on my weight," Carrie says in the film. "They take measurements. It's intense."

She had previously revealed that she had to lose weight for her return as Princess Leia, but not how she had shed the pounds, telling Britain's Good Housekeeping magazine, "They (Star Wars' producers) don’t want to hire all of me – only about three-quarters! Nothing changes: it’s an appearance-driven thing."

The new documentary, called Bright Lights, is not the first time the actress and screenwriter has opened up about her personal life and strained but loving relationship with her mother, a major Hollywood star in the '50s and '60s.

In 1987 she published the semi-autobiographical novel Postcards From The Edge, which told the story of an actress who is forced to live with her mother, a faded film star, due to battling substance abuse. The novel was later made into a critically acclaimed film starring Meryl Streep, Dennis Quaid and Shirley MACLaine.

Carrie has also opened up about her battle with bipolar disorder and substance abuse in her autobiography, Wishful Drinking.

Bright Lights is scheduled to air on America's HBO network early next year (17).