US TV
Rex Features
The judge took to the stage during last night's live show to sing 'I'm Just Here For The Music', a track premiered during host Ryan Seacrest's radio show earlier this week.
Speaking to TV Guide beforehand, she had admitted that she was initially hesitant about appearing, saying: "I wasn't sure if I was going to do it. Timing was of the essence.
"I put everything together on Saturday and rehearsed on Sunday. It was really good, and I am feeling good about it... There's a lot to see in less than three minutes."
Former Idol contestant Chris Daughtry and Gwen Stefani's band No Doubt were also on hand to perform.
This week's episode saw 64 million votes cast to determine which three contestants would make it to the semi finals.
> 'American Idol' down to final three
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