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The New York Times documentary, which was released in February, sent shockwaves around the world as it laid out the extent of the misogyny she faced in her rise to superstardom.
It also detailed the controversial conservatorship that allows Britney's father Jamie to oversee her finances and personal affairs since 2008.
Britney, 39, had only previously alluded to the contents of Framing Britney Spears after it aired - but has now directly addressed the film, saying she was left "embarrassed" by some of its content.
"I didn't watch the documentary but from what I did see of it I was embarrassed by the light they put me in ... I cried for two weeks and well .... I still cry sometimes!" she wrote in a lengthy Instagram caption that accompanied a video of her dancing to Aerosmith's Crazy.
While several of Britney's 29 million followers shared their support for the Toxic singer on Instagram, others were quick to speculate whether Britney had even written the detailed post herself - with some even claiming that her captions had been written by someone who works as part of her conservatorship.
"There is not a single chance she wrote this," one fan wrote, while another said: "I wanna actually hear her say this.... they always making up captions for her..."
Selling Sunset star Chrishell Stause was similarly unconvinced, writing: "Instead of dancing, can we get a video of you typing your own captions next time? I want to believe you it's you speaking for yourself, but I am sceptical. We love you!"
"Makes you wonder who wrote and posted this," another person chipped in, while a fellow Britney fan penned: "You didn't type this because you wouldn't say that about the documentary."
Tyla has contacted reps for Britney Spears for comment about fan allegations.
The news comes after the co-creator of Framing Britney Spears has teased there could be a follow-up documentary in the works.
"There was so much that made the cutting room floor because we just didn't have the time to get into it... we would love to do a part two," Liz Day told Access Hollywood.
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