The couple have been dating since 2008 and are expecting their first child together.
Spiritual adviser and author Deepak Chopra officiated at Saturday's ceremony, during which Keys wore a jeweled headband and single-shoulder, ivory silk goddess gown by Vera Wang, the report said.
The groom wore a white jacket, pink shirt, black pants and white shoes, E! said.
Celebrity Couples of 2014 [PHOTOS]