Britney Spears fans are in a frenzy after the star's mother seemingly confirmed fears the star is being held against her will in rehab.

The 37-year-old singer entered a mental health facility earlier this month after she cancelled her Las Vegas residency, and is said to be struggling after her father nearly died from a ruptured colon.

Now, a "free Britney" hashtag is trending on social media after Spears' mum "liked" comments on social media which claimed the star is being "held against her will" in a rehabilitation centre.

The speculation started after an anonymous "inside source" went public with the claim on a popular podcast called Britney's Gram, saying: "It was reported that Britney Spears checked herself into a mental facility at the end of March. We have information that that might not be true."

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The internet has quickly hopped on the #FreeBritney bandwagon, picking apart perceived clues left by the pop superstar.

Britney's mother Lynne shared a picture of a woman on her knees with the words: "When God's warriors go down on their knees the battle is not over; it has just begun."

She captioned it: "This is 'faith'."

Lynne then went on to 'like' a number of the comments.