Few voices in country music work as well together as Carrie Underwood [1] and Keith Urban [2]'s. A little over a month after delivering an inspiring performance of their duet, "The Fighter," at the Grammys [3], the duo teamed up again to get everyone at the ACM Awards on their feet. No one in the audience could resist dancing along (especially Urban's wife, Nicole Kidman [4]), so check out their live rendition of the hit above (starting at the 3:30 mark)!