*More details have been released regarding Bobbi Kristina’s special appearance at this Sunday’s 2012 Billboard Music Awards in Las Vegas.

As previously reported, her mother Whitney Houston will be honored with the Billboard Millennium Award in a musical tribute.  Jordin Sparks and John Legend are set to perform in the tribute, while Bobbi Kristina, and Houston’s sister-in-law, Pat Houston, will appear to accept the award in Whitney’s honor.

Jordin Sparks and Whitney Houston in a scene from "Sparkle"

Sparks, an “American Idol” champ, plays Houston’s daughter in the upcoming remake of the film “Sparkle,” which hits theaters in August.

This year’s Billboard Music Awards airs live May 20 on ABC at 8 p.m. ET from the MGM Grand Arena. Hosting will be “Modern Family” co-stars Julie Bowen and Ty Burrell.

Previously announced performers include Katy Perry, Chris Brown, Justin Bieber, Carrie Underwood, LMFAO, CeeLo Green, Kelly Clarkson, Usher, The Wanted, Linkin Park and Nelly Furtado.