Baseball fans know that the 2011 championship match-up is between the Texas Rangers and the St. Louis Cardinals, who are tied 1-1 in the seven-game series. The pop star scored the honor after her big sister, Dallas, tweeted that Demi should sing 'The Star-Spangled Banner' during the MLB showdown. She relentlessly petitioned to make it happen, and it did!

Demi joins the likes of 'American Idol' winner Scotty McCreery, Trace Adkins and Zooey Deschanel and Ronnie Dunn, who have all been asked to sing the song during this year's World Series. Game 3 airs tomorrow on Fox.
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