'Glee' star: Singing for FLOTUS was scary

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Even "Glee" stars get stage fright sometimes.

Darren Criss, the singer, actor and co-star of Fox's "Glee" had the jitters while performing his song "Not Alone" for first lady Michelle Obama and President Barack Obama's two daughters, Sasha and Malia, at the Kids' Inaugural Concert on Saturday night.

(PHOTOS: Obamas attend kids' Inauguration concert)

"It was incredibly nerve-racking," he told POLITICO at the Daily Beast's Bipartisan Brunch in Washington on Sunday. "I made a couple of mistakes, stuff that nobody would notice but me, in the song that I wrote and played -- I've done it thousands and thousands of times before, never messed it up."

But seeing the first family in the crowd shook him up.

"I was looking out at the audience and I see Michelle and Sasha and Malia and I was like, 'Ah!' And my hands started shaking like in 'Back to the Future' -- my hands were disappearing," he said. "Luckily no one noticed. Everyone was just there to enjoy the music for a really great cause."

The concert, which also featured performances by Usher and Katy Perry, benefited military families.