Simon Cowell Judges "Worst Live Performance" Ever

Simon Cowell recently watched what he called "the worst live performance" he's ever seen on X Factor, the British version of American Idol.

John and Edward, 17-year-old identical twins from Dublin, Ireland, have made waves on the show with their big hair and mediocre singing abilities. They recently performed Britney Spears' "Oops!...I Did It Again" to cheers from the audience. Simon however, had other things to say.

"The worst live performance I've ever sat through in all these years of doing the show," the judge said.

Check out the clip here.