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Watch Gwen Stefani Own Blake Shelton In 'Tonight Show' Lip Sync Battle

Two words: 'Endless Love.'

In honor of the seventh season of "The Voice" kicking off on Monday, veteran coach Blake Shelton and newcomer Gwen Stefani visited "The Tonight" show on Wednesday night. Only this time it was their turn to get judged, as they became the latest victims, we mean contestants, on the show's famed Lip Sync Battle.

Shelton, champagne glass in hand, went old school with a cover of Dutch singer Taco's "Puttin' On The Ritz," complete with a bit of impressive tap dancing. Fallon flipped the script and tackled Ellie Goulding's "Burn," with some very energetic hand gestures his own illuminating prop, which was just weird. But leave it to pop royalty Stefani to up the ante with a super high-energy cover of Carly Rae Jepsen's "Call Me Maybe."

What did they do for round 2? Check it out.