"The Voice" coach/Maroon 5 singer will marry the model in Cabo San Lucas, Mexico, a source confirmed to "Access Hollywood."
Close friends and family will attend the ceremony, including celebrities such as Behati's fellow Victoria's Secret models Candice Swanepoel and Erin Heatherton, as well as actor Jonah Hill (whose brother Jordan manages Maroon 5).
Levine, 35, and Prinsloo, 25, started dating in 2012, broke up in May, 2013, and got engaged in July 2013. Prinsloo is from Namibia. A source told Us Weekly last summer: "After Adam broke up with Behati, he couldn't stop thinking about her. He realized he really loved her and wanted to be with her."
The singer previously dated models Anne Vyalitsyna and Nina Agdal.
This will be the first marriage for both of them.