(CNN) -- The list of those on the program for superstar pop singer Whitney Houston's funeral covers the spectrum of the entertainment world. 

Actor Kevin Costner, who starred with Houston in the 1992 hit movie "The Bodyguard," will speak at the service on Saturday, according to a source with knowledge of the funeral plans. 

Gospel singer Kim Burrell told CNN's Jason Carroll she will sing, "I Believe in You and Me," a selection made by the Houston family. The song was included in the soundtrack from "The Preacher's Wife," a 1996 film starring Houston. 

The ceremony also will feature performances by Stevie Wonder, Alicia Keys and Aretha Franklin, who is Houston's godmother. Singer Roberta Flack will attend, but it was unclear whether she would perform. 

Houston's ex-husband, Bobby Brown, has been officially invited to the funeral, according to Houston representative Kristen Foster. 

Brown was openly emotional at a show in Mississippi on Saturday night following news of Houston's death, then pulled out of a performance in Nashville on Sunday night and flew to Los Angeles. 

He will rejoin New Edition Thursday night for a performance in Upper Marlboro, Maryland, according to a New Edition publicist. Brown considers performing as therapy to get him through a difficult time, a source close to Brown said. 

Foster said gospel singer Donnie McClurkin, actor-director Tyler Perry, producer Clive Davis, composer and music director Rickey Minor and Houston's cousin, Dionne Warwick, are among those on the program for the funeral. 

Minor, who worked with Houston, told CNN that he will be involved with the funeral's music and that the New Jersey Mass Choir will perform. 
What was his reaction at the news?
openly emotional