The Boy Is Mine hitmaker will pull double duty at the lavish Los Angeles nuptials, as she will also serve as a bridesmaid for her future sister-in-law, Princess Love, before performing Etta James classic At Last as the newlyweds share their first dance as husband and wife.
Brandy won't be the only Grammy Award winner to hit the high notes during Ray J's big day on 12 August (16) - he has also hired Anthony Hamilton to sing his 2009 release The Point of It All as Princess Love walks down the aisle, reports TMZ.com.
Ray J, who infamously co-starred in Kim Kardashian's Kim K Superstar sex tape, proposed to his on-off girlfriend in October (15), just eight months after Love was arrested for an alleged domestic assault.
They soon reconciled, and the One Wish singer, 35, popped the question again in December (15), in front of friends and family.
The wedding will be filmed for broadcast on the couple's U.S. reality show, Love & Hip Hop: Hollywood. The new season premieres on 15 August (16).