Demi Lovato: World Series National Anthem Singer!

Demi Lovato keeps it casual as she arrives at LAX Airport on Sunday (October 28) in Los Angeles.

On the same day, the 20-year-old singer and X Factor judge sang her heart out to the National Anthem at the World Series in Detroit, Mich.

PHOTOS: Check out the latest pics of Demi Lovato

“So excited to sing the National Anthem at game 4 of the World Series tonight!!,” Demi wrote on her Twitter account.

In case you missed it, check out Zooey Deschanel singing the National Anthem at game 3.