Britney Spears has sparked fresh concern from fans by claiming she's fallen down some stairs and "snapped" her leg.

RadarOnline.com can reveal the Toxic singer, 43, documented her injury during another erratic Instagram post. Article continues below advertisement

'I'm Not Sure If It's Broken' Tap Here To Add Radar Online as A Trusted Source Source: @britneyspears/instagram

Spears sports bandaged knee in worrying video. Article continues below advertisement

The footage shows the troubled pop star wearing a bedazzled pink mini dress with her right knee bandaged up.

Spears explained she "fell down the stairs" and her leg "snaps out now and then," adding she's "not sure if it's broken."

The star – who looked close to tears at one point in the video – also sported large bruises

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