Sneak Peek: Behind Rihanna's Wild 777 Tour

To promote her latest album, Unapologetic, mega pop star Rihanna embarked on an intense seven-show tour that took place in seven countries in the mere span of seven days, which was deemed the 777 Tour. ET has a first look at a clip of the documentary that captured the tour.

The concentrated mini tour may have achieved its goal of helping Rihanna promote her seventh studio album, but the Grammy-winning singer admits very early on that the city-hopping trek is exhausting.

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"Second show in, it's already feeling a little brutal," the Barbadian singer says in the clip before she and her crew take the stage in Toronto.

For the tour, which began on November 14 of last year, Rihanna traveled a total of nearly 12,000 miles around Europe and the Americas, performing in Mexico City, Toronto, Stockholm, Paris, Berlin, London, and New York City on sequential days.

Although she was worn out after her last show in New York City on November 20, she was rewarded with more than rest the following day, when her first single off Unapologetic, "Diamonds," soared to No. 1 on the Billboard Hot 100.

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The 25-year-old dance-track vocalist is currently on her "Diamonds World Tour," her fourth world tour, and is about to wrap up her North American leg before heading through Europe, Oceania, and ending in South Africa in October.

Watch the sneak peek at Rihanna 777 above and check out the full behind-the-scenes look at her thrilling tour when it premieres Monday, May 6 at 8 p.m. on FOX.