Sarah Jessica Parker, Bette Midler and Khloe Kardashian are a few of the Hollywood stars who have been posting about it.
The documentary has reignited the fight against Spears' conservatorship, with thousands calling on her father to drop it.
The documentary shows the way her breakup with Justin Timberlake was framed at the time, as well as her controversial interview with Diane Sawyer, during which Spears cried.
Miley Cyrus joined the chorus of people standing by Britney Spears, by telling the audience "We love Britney" during her "TikTok Tailgate" performance ahead of the Super Bowl yesterday.
Spears' father has been a legal conservator for her for more than a decade, after the pop singer's mental breakdown.
At a court hearing last year, the singer's lawyer, Samuel D. Ingham III, claimed Spears had become afraid of her father and wanted him removed for her conservatorship entirely after he allegedly hired a new manager without consulting her.
She continues to fight to have her dad removed from it. The next court date will be on February 11.