The 35-year-old singer, who was named the sexiest man alive by a magazine last year, flaunted his new look by a taking a selfie with fiancee Behati Prinsloo, reported E!Online.
"Apocalypse prep course complete," he captioned the selfie on Twitter.
Adam is no stranger to changing up his looks. Last month he debuted a half-shaved rocker haircut at 'The Voice' season 6 private concert in LA.