Nathan Fillion & Sarah Silverman: Emmys 2013 Performance - Watch Now!

Nathan Fillion and Sarah Silverman take the stage to help Neil Patrick Harris sing “The Number in the Middle of the Show” during the 2013 Emmy Awards held at the Nokia Theatre L.A. Live on Sunday (September 22) in Los Angeles.

The 42-year-old Castle star and Sarah, 42, surprised Neil on stage during the number, where they danced along with some back up dancers and sang some hilarious lyrics – check out the video below!

Also pictured inside: Nathan hitting the red carpet earlier in the evening with his girlfriend Mikaela Hoover.

The 2013 Emmy Awards are only on the air for a bit longer – catch the last couple of minutes on CBS!

FYI: Sarah is wearing a Deadly Dames by Micheline Pitt dress, Walter Steiger heels, and a Nola Singer bracelet.