Riley, who plays Effie White, and LaFontaine, who plays Deena Jones, will perform the song “Listen” at the concert, according to the host publication, What‘s on Stage.
Riley is a nominee herself, in the category Best Actress in a Musical. The show is up for several other categories as well, including Best Supporting Actor in a Musical (Adam J Bernard), Best Choreography, and Best New Musical. See all the nominees here. Dreamgirls opened on Broadway in 1981, but this is its London premiere.
Directed by Casey Nicholaw (Aladdin, Something Rotten!), the revival is scheduled to transfer to Broadway, but Riley and LaFontaine have not been confirmed to come along with it.
Tickets for the WhatsOnStage Awards can be ordered here.