Singer Kelly Clarkson, who won the first season of "American Idol", will now appear as a guest judge for the reality TV show's last season.

The singer will join the panel for the show and will also perform, reports femalefirst.co.uk.

"We have invited her to be part of this season and she's really happy to be. She will be a guest judge on our first live top 10 show and she'll also perform,` said Trish Kinane, the show's executive producer.

This season will be the final season of the show.

Music mogul Simon Cowell will also be returning as a judge for the finale.

"Yes, I appreciate Simon's part in the history of the show and it's a very important part. I think the most we can expect is for Simon to be at the finale,` Kinane said.