This is inneresting!
Ch-ch-check out the sign (below)!!!
While we would have rather seen all four Voice US judges perform on The Voice UK's EPIC finale show, Adam Levine and Maroon 5 mashed up recent hits Payphone and Moves Like Jagger for a delightfully ear splitting performance.
Let Adam serenade you with those insidious high-notes (above)!
Eh, got a little flat on the transition there, Adam? It happens to the best of 'em!