Uh-oh! Did you catch Jesse McCartney’s National Anthem snafu NASCAR’s Pepsi 500 over the weekend? The former teen heartthrob was performing “The Star-Spangled Banner” at Sunday’s race at the Auto Club Speedway, in Fontana, California when he forgot an entire line of the nation’s most beloved song!

Poor Jesse. The star has chalked the humiliating ordeal up to a bad case of nerves from performing in front of such a large crowd.

“Here At the Nascar race !So much fun! Can’t believe I forgot the words to the Anthem! I’ve performed it 100 times. Bad Nerves today I guess….” Jesse wrote in a post on his Twitter page right after the performance.

BTW, Jimmie Johnson was the victor in yesterday’s race.