Who do you think won ? Gwen Stefani and Blake Shelton both lip - sync for Jimmy Fallon . ` ` The Voice '' They team up for a ` ` duet '' Lip - sync ##s are popular part of ` ` The Tonight Show Starring Jimmy Fallon ''
Gwen Stefani and Blake Shelton both lip - sync for Jimmy Fallon . ` ` The Voice '' They team up for a ` ` duet '' Lip - sync ##s are popular part of ` ` The Tonight Show Starring Jimmy Fallon ''