“American Idol” rocker Chris Daughtry has scored the biggest-selling record in America of 2007 after sailing past the three million sales mark with his debut, “Daughtry”. The success also gives Daughtry the fastest-selling rock debut in the 16-year history of the Billboard album chart's sales tracking system, Star Pulse informs.

The album has also been certified triple platinum and is the fifth best-selling digital release of all time.

Daughtry admits he has been struggling to come to terms with his success since the album hit the one million sales mark.

"Sometimes it never really sinks in where you're at in your career. It seemed so unreal when I found out that we were platinum. I was just at home, doing normal everyday stuff at home, taking out the trash, dishes and whatnot, and I found out we're selling over a million albums... It just felt so unreal. It's kind of hard to grasp sometimes," he said.