Carrie Underwood: Emmys 2013 Performance - Watch Now!

Carrie Underwood is stunning during a performance at the 2013 Emmy Awards held at the Nokia Theatre L.A. Live on Sunday (September 22) in Los Angeles.

“The coolest thing about singing “Yesterday” on the #Emmys is the sweet letter I got from @PaulMcCartney giving me his blessing to sing it!” the 30-year-old country singer tweeted after the performance.

PHOTOS: Check out the latest pics of Carrie Underwood

Earlier in the day, Carrie donned a gorgeous purple gown while walking the red carpet at the ceremony, which was hosted by Neil Patrick Harris.

FYI: Carrie is wearing a Randi Rahm gown.