Katy Perry, dressed as a mermaid in American Idol, falls from her chair and tumbles to the ground.

KATY Perry, dressed as Ariel in The Little Mermaid, fell from her chair during last night's American Idol.

Although she looked amazing in the tail, the 37-year old struggled to move in her costume for Disney Night on the Show.

American Idol's Katy Perry fell from her chair

While dressed as Ariel in The Little Mermaid, she struggled to move.

Katy made headlines earlier this season when her pants split open during a live performance on the show of her 2009 hit song Teenage Dream.

Katy continued the show, a large yellow T-tape visible across her back, and she continued.

The star showcased her stunning costume