Demi Lovato Sings National Anthem at World Series 2012 - Watch Now!

Demi Lovato sings out the National Anthem at game four of the MLB World Series at Comerica Park in Detroit, Mich., on Sunday night (October 28).

The 20-year-old singer tweeted just before she took the field, “So excited to sing the National Anthem at game 4 of the World Series tonight!!!!!”

PHOTOS: Check out the latest pics of Demi Lovato

The San Francisco Giants beat the Detroit Tigers in a four game sweep to win the 2012 title.