We all know Blake Shelton and Gwen Stefani can sing, but on Wednesday's "Tonight Show," "The Voice" judges had to brush up on their lip-syncing skills.

Shelton was the first performer of the night, lip syncing "Putting on the Ritz" by Taco. The goofy country crooner's performance included tap dancing and champagne.

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Fallon was next and hilariously mouthed the words to Ellie Goulding's "Burn," but it was Stefani's rendition of Carly Rae Jepsen's "Call Me Maybe" that got the audience riled up. She used her No Doubt moves to put a special spin on the song.

Shelton kept it slow and lip synced Starship's ballad "Nothing's Gonna Stop Us Now," and Fallon followed that up with Spike Jones' "Cocktails for Two."

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Stefani ended the battle with Lionel Richie and Diana Ross' "Endless Love," but Shelton just couldn't help making it a duet.

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