Mariah Carey says her upcoming wedding to James Packer is "the most important thing that's ever happened!"

Although Mariah - who was previously married to Tommy Mottola and Nick Cannon, the father of her five-year-old twins, Moroccan and Monroe - says she is happier than ever, she admitted her life hasn't always been charmed.

She says: "I am not Cinderella. My life has not been a fairytale."

And Mariah pokes fun at her diva-reputation in the trailer, quipping: "I have a rule which states that I will not be seen on fluorescent lighting without sunglasses."

Speaking previously about the eight-episode docuseries, Mariah said: "I'm excited to bring my fans into my life for the next journey I'm about to embark on. I'm already having so much fun with this documentary and I know you will too. There is nothing like capturing these moments."

The cameras have been following Mariah on her 'Sweet Sweet Fantasy' tour in the United States, Europe and Africa and as she plans her wedding to James.

Jeff Olde, ex ecutive Vice President, Programming & Development at E! said: "Mariah is one of the most captivating pop superstars of our time and one of the rare artists whose first name alone is instantly recognised around the globe.

"The series will present a unique, vulnerable and surprisingly humorous side to Mariah that her fans have never before seen while showcasing her unparalleled celebrity lifestyle filled with true glamour, maximum luxury and ultimate stardom."