Simon Cowell feels Lady Gaga, Beyonce Knowles and Katy Perry are among the world's most boring singers.
"If you only ever heard Lady Gaga, she's the most boring singer in the world. You've got to see her - you need TV," contactmusic.com quoted Cowell as saying.
"Same with Beyonce and Katy Perry. We're all about image. You have to have that X factor," he added.