Global superstar Beyoncé is due to unveil her personal documentary, entitled 'Life Is But A Dream', this Saturday (February 16) and has opened up about the project to Oprah Winfrey.

The U.S. talk show legend was at the red carpet premiere of Beyoncé's film last night and also interviewed her for Oprah's Next Chapter. The 'Halo' beauty, who is known for keeping her private life out of the spotlight as much as possible, explained that she had to get the permission of both her husband Jay-Z and her mother before filming began:

"I’ve been anticipating this moment … this is huge for me. I felt like it was time for people to see who I am….this is three years in the making, and once I saw my daughter I knew that was the ending to the story and this documentary.”

She added that baring so much of her own life felt like a big risk, but giving birth made her stronger so it came at the right time for her: "I had to get the approval of my mother and Jay-Z. After giving birth I felt like a new woman I felt so much more brave… Mystique is important to me, but at some point it’s time and I’m ready.”

Watch footage from last night's premiere of 'Life Is But A Dream' here: