Most of the country stars stayed in Las Vegas after the ACM Awards on Sunday to tape a special concert for the troops.  Carrie Underwood took it a step farther, co-writing a special song for the "ACM Presents: An All-Star Salute To The Troops." 

Carrie will offer the song as a free download for anyone donating to the ACM's 'Lifting Lives' charity when the recording is completed.  In addition to her performance of the song, there's a lot of buzz regarding the outfit she wore.  Watch the video and tell us which is the most impressive, the performance or the outfit.