"Something I've been VERY excited about for a VERY long time is going to be happening VERY soon," she tweeted shortly before linking to the track on iTunes. "Safe & Sound" is a collaboration between the country-pop singer and alt-folk duo The Civil Wars.
By Friday evening, "Safe & Sound" had already hit No. 1 on the iTunes sales charts.
Listen to the song here:
The Hunger Games hits theaters on March 23, 2012.
What do you think of "Safe & Sound?"