Watch James Taylor & Zac Brown Band Moving Performance at 2011 ACMs!

There were a lot of standing ovations last night after a slew of powerhouse performances took the stage during the 2011 Academy of Country Music Awards in Las Vegas. So who did the performance of the night belong to? It's hard to tell, but after James Taylor joined the Zac Brown Band onstage, the crowd certainly leapt to their feet.

"Wonderful!" Nicole Kidman, standing next to country-crooning hubby Keith Urban in the front row, was seen mouthing as TV cameras panned the audience after the Zac Brown and James collaboration.