During a tenth anniversary tribute for 9/11 during the U.S. Open, Cyndi Lauper committed a lyrical blunder, messing up the words to the national anthem Saturday night, à la Christina Aguilera Superbowl style.

Performing before the beginning of the final match of the U.S. Open between Serena Williams and Caroline Wozniacki, Lauper botched the lyrics of The Star-Spangled Banner during a remembrance in honor of the Sept. 11 attacks.

Lauper tripped over the same part of the national anthem as Aguilera did earlier this year. Instead of singing the correct words, O'er the ramparts we watch'd were so gallantly streaming, Lauper instead sang O'er the ramparts, we watched as our flag was still streaming.

Many enraged Americans took to Twitter to call out the infamous Girls Just Wanna Have Fun singer for her mishap.

Another lame brain messes up the National Anthem, said one Twitter user, @QC16. Ever heard of practice?

Aguilera committed a similar lyrical blunder during the 2011 Superbowl, when she sang What so proudly we watched at the twilight's last gleaming instead of, O'er the ramparts we watched, were so gallantly streaming.

Cyndi Lauper tweeted after the event, Whew, I just did the anthem for the US open. It was an awesome experience.I got choked up in the middle remembering 9/11.

While Lauper has not confirmed whether or not the lyrical mishap was an accident or a purposeful tribute for 9/11, she did tweet about her genuine intentions during the U.S. Open national anthem performance.

The moon shone done on us and I tried to say a prayer at the same time.. I hope I didn't mess up too bad. I wanted it to be comforting, Cyndi Lauper tweeted.