The 34-year-old singer and judge of The Voice USA proposed to the Victoria's Secret catwalk star after they broke up around four months ago.
His spokesman confirmed the news to People.com, saying: "Adam Levine and his girlfriend Behati Prinsloo are excited to announce they are engaged to be married.
"The couple recently reunited and Adam proposed this weekend in Los Angeles," he added.
The 24-year-old Namibian model and Adam began dating in 2012, after the This Love singer announced his split from Russian model Anne Vyalitsyna.
The couple made their debut at GQ's Gentleman Ball in New York in October, but later decided to part in March before they reunited.