Britney Spears and Justin Timberlake.

Viewers tuning into Framing Britney Spears on Tuesday evening were stunned as they realised just how badly the US pop star has been treated over the years. The New York Times documentary finally aired in the UK on Sky and looked at the conservatorship that Britney has been under for over a decade. The film also includes footage of Britney's rise to fame and shows just how much she was hounded by the paparazzi, which led to her mental breakdown.

It also touches upon her very public break up with fellow pop star Justin Timberlake, whom she split with in March 2002. At the time it was rumoured that Britney had been unfaithful to Justin, and she seemed to bear the brunt of their romance coming to an end.

One clip showed Britney being asked in an interview if she was still a virgin, and then cut to a radio chat with Justin following the break up. During the interview, Justin was asked by the radio host if he had had sex with Britney during their relationship - and he reveals that he did, before laughing hysterically.

Britney Spears and Justin Timberlake.

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Viewers were disgusted with Justin's actions and took to Twitter to vent.

"Wow Justin Timberlake really treated Britney like trash after their break up and let the media destroy her. So gross to look back on now #FramingBritneySpears," one person tweeted.

Another wrote: "#FramingBritneySpears highlighting how trash Justin timberlake is, he’s always made me cringe."

A third added: "I am SO furious at Justin Timberlake. I was too young to understand at the time but my god how did people get away with this?? To a young twenty-year-old?!?! #FramingBritneySpears #FreeBritney."

A fourth viewer noted: "'You get sucked in by people that aren’t necessary' and the next scene cuts to Justin Timberlake...YEP He is TRASH! #FramingBritneySpears."

Britney Spears and Justin Timberlake.

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The documentary also refers to Justin's hit song, Cry Me A River, which apparently alludes to Britney's documentary and also includes a lookalike of her in the music video.

"We all liked that song when it came out but it does highlight what an a**hole Justin Timberlake was and how Britney got so much s**t because of him #FramingBritneySpears," one viewer added on Twitter.

Following the release of the documentary in the US, 40-year-old Justin took to Instagram to publicly acknowledge his actions and apologise to his ex-girlfriend.

Part of his post read: "I've seen the messages, tags, comments and concerns and I want to respond. I am deeply sorry for the times in my life where my actions contributed to the problem, where I spoke out of turn, or did not speak up for what was right.

"I understand that I fell short in these moments and in many others and benefited from a system that condones misogyny and racism."