The Maroon 5 frontman beat off stiff competition from the likes of 'Luther' actor Idris Elba, singer Justin Timberlake and retired soccer star David Beckham to the prestigious title, as well as more unusual entries including chat show host Jimmy Fallon.
On Tuesday night's (19.11.13) episode of 'The Voice', host Carson Daly announced Adam's big win to the studio audience, much to the singer's embarrassment.
Carson was quick to take a dig at Adam's fellow coach Blake Shelton, joking that he missed out on the title this year, while Blake engulfed the 'Payphone' hitmaker in a big hug and told him he is "beautiful for what's on the inside".
Adam - who takes the title from 2012's winner Channing Tatum - told People magazine: "As a musician, you have fantasies that you want to win Grammys, but I didn't really think that this was on the table. I was just amazed and stunned and it almost seemed like they were kidding, but they weren't, so that's cool."
The 34-year-old hunk also confessed he was looking forward to settling down with his fiancée, Victoria's Secret model Behati Prinsloo, after popping the question in July.
He said: "I didn't think marriage was for me for a long time. I was ready when I was ready. That's about as simple as it could possibly be."
The handsome star admits to practicing yoga and spinning to stay fit and focused as his career continues to evolve, recently branching out from music into fashion design and acting.
Adam added in his winner's interview: "This is just a really interesting time where everything seems to be heading in a certain direction. And I'm not taking any of it for granted."