Watch Gwen Stefani and Blake Shelton Lip Sync Battle with Jimmy Fallon

Gwen Stefani and Blake Shelton appeared on The Tonight Show Wednesday and had a lip sync battle with Jimmy Fallon, who is known for playing quirky games with guests on his show.

One of the performances had Shelton and Stefani singing the duet “Endless Love” with the male and female parts switched. Stefani played Lionel Richie’s smooth, deep voice, and Shelton mouthed the words to Diana Ross’s part.

Shelton and Stefani are coaches on the newest season of The Voice.