United Kingdom, Jan. 31 -- Katy Perry thinks Carrie Underwood is the ideal person to judge 'American Idol'.

The 40-year-old singer announced her departure from the judging panel last year and it later emerged the country singer - who shot to fame after winning the fourth season of the singing competition in 2005 - would be replacing her, and the 'Teenage Dream' hitmaker believes there is no one better qualified.

Katy told People magazine: "She was born on that show. I think she knows how to steer it.

"She actually truly knows... What it feels like to be in their shoes. We could only metaphorically feel that as judges.

"As artists, we've been in some sort of their shoes, but she has lived every single day. So I think she's going to hav...