Among the many stars expected to be at the Screen Actors Guild headquarters for testing Monday are Jimmy Jean-Louis of "Heros," "Ray" star Regina King, Hill Harper of "CSI New York" and Tatyana Ali of the classic TV show "The Fresh Prince of Bel-Air."

The event is aimed at encouraging African-Americans to undergo tests of their own on National HIV Testing Day, which is next Wednesday, SAG said in a news release.

The Hollywood effort is part of a national commitment to end the AIDS epidemic among blacks in America by 2012, SAG said.