Blake Shelton & Gwen Stefani Battle Jimmy Fallon in Hilarious Lip Sync Contest br br Jimmy Fallon's Lip Sync Battles are viral video phenomenons. As John Basedow (@JohnBasedow) reports, the 'Tonight Show' host's latest competition features 'The Voice' judges Blake Shelton and Gwen Stefani, who perform songs including 'Call Me Maybe,' 'Endless Love' and 'Puttin' On The Ritz.