Kings of Leon star Caleb Followill has said that he is worried about possibility of Susan Boyle selling more records than the group.

Speaking to The Sun, the singer said of the group's upcoming album release: "I am worried about Susan Boyle."

"If she sells more records than us. She is a force of nature, that woman."

"I am anxious to see how our album does now it's out in the UK. I usually don't think about it but the day before I start to think too much."