Apparently she beat out Psy, Taylor Swift, the author of "50 Shades of Grey", and the CAST OF TWILIGHT (?!) for the title.
Adele is so much more than a mere phenomenon (ahem...cast of Twilight). Every song that this lady releases is a JAM. And though she didn't release a new album this year, or tour, she still totally deserves this title because she's one of the most amazing artists of our time. You can read the full article from Billboard.com here