Levine, 35, costars alongside Keira Knightley, Hailee Steinfeld and Mark Ruffalo in the John Carney-directed comedic drama. Begin Again is Levine's fist major acting role.
The Maroon 5 frontman and Prinsloo, a Victoria's Secret model, announced their engagement in July 2013. The pair began dating in 2012, broke up in the spring of 2013, and became engaged to be married after reconciling in the summer.
“She makes me the best person I can be," Levine said Saturday. "She's the best in the world."
Swim Week Miami Beach 2014 [PHOTOS]