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Luke Bryan apologizes for checking lyrics on his hand during All-Star national anthem

Luke Bryan performs during the 2012 Country Stampede at Tuttle Creek State Park on June 21, 2012, in Manhattan, Kan. Rick Diamond/Getty Images

(CBS/AP) Luke Bryan says he is sorry for consulting the lyrics to the national anthem written on his hand during his performance at the MLB All-Star game.

The country singer admitted to checking the lyrics, but also checking his watch during his performance on Tuesday night.

"I had a few keys (sic) words written down to insure myself that I wouldn't mess up.. I just wanted to do my best. I promise it was from the heart," the singer wrote on Twitter.

He continued saying, "If I offended anyone with my approach I sincerely apologize. Anytime I sing the anthem it is an honor and my heart beats out of my chest. I did check my watch because I knew the stealth bomber would fly over 2 minutes in and I knew a started a little late."

Bryan sang the anthem before the National League blew out the American League 8-0 in Kansas City, Mo.

See a video of his performance below.

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