London, who will play the role of Nettie, competed on "American Idol" against Fantasia Barrino, who won the competition and will star as Celie in the Broadway company of The Color Purple beginning April 10.
Williams, who will play Shug Avery, starred in the title role in Aida on Broadway. Williams, Beyoncé Knowles and Kelly Rowland, made up the trio Destiny's Child, which sold over 40 million albums.
Bayardelle will play the lead role of Celie, which she recently played on Broadway.
As previously announced, Felicia P. Fields, who received a Tony nomination for playing the feisty Sofia, will reprise her role on tour.
As luck would have it, Bayardelle, Williams and Fields are Chicago natives. The touring cast also includes Rufus Bonds, Jr. as Mister; Stu James as Harpo; Stephanie St. James as Squeak; Lynette Dupree, Kimberly Ann Harris and Virginia Ann Woodruff as the Church Ladies; Bridgette Bentley as the Church Soloist; and Adam Wade as Ol’ Mister.
Also in the cast are Shani Borden, Brian H. Brooks, Renee Monique Brown, Tiffany Daniels, Quentin Earl Darrington, Kellen Davis, Lesley Terrell Donald, Andre Garner, Dameka Hayes, LaTonya Holmes, Jenna Ford Jackson, Trent Armand Kendall, Grasan Kingsberry, Keith Byron Kirk, Rhett George, Corrine McFarlane, Sumayah McRae, Anthony Wayne and Mariama Whyte.
Based on the Alice Walker novel and the Steven Spielberg film, The Color Purple features a score by Brenda Russell, Allee Willis and Stephen Bray and a book by Pulitzer Prize winner Marsha Norman ('night, Mother). Gary Griffin directed on Broadway and will also direct the tour.
The musical's main producer is Oprah Winfrey, who received an Oscar nomination for her portrayal of Sofia in the film version.
The Broadway production of The Color Purple began previews on Nov. 1, 2005, at the Broadway Theatre and officially opened Dec. 1, 2005. The show was nominated for 11 Tony Awards. LaChanze, who originated the lead role of Celie, earned the show's only Tony win, for Best Actress in a Musical.
The tour is produced by Winfrey, Scott Sanders, Roy Furman, Quincy Jones, Creative Battery, Anna Fantaci and Cheryl Lachowicz, Independent Presenters Network, Lowy Family Group, Stephanie McClelland, Gary Winnick, Jan Kallish, Nederlander Presentations, Inc., Bob and Harvey Weinstein, Andrew Asnes and Adam Zotovich and Todd Johnson, in special association with AEG Live.
The Cadillac Palace Theatre is located in Chicago at 151 West Randolph Street. For tickets to the Chicago run, call Ticketmaster at (312) 902-1400, visit www.BroadwayInChicago.com or visit the Broadway In Chicago box offices (at 151 West Randolph Street, 24 West Randolph Street and 18 West Monroe Street) or another Ticketmaster ticket center. For groups of 20 or more, call (312) 977-1710.
For more information on the show, visit www.colorpurple.com.