O'Day, seen on TV's "Making the Band 3," will play the show's resident princess opposite former "Making the Band" star Ashley Parker Angel as Link Larkin through Aug. 31.

The actress-singer was a child performer who appeared in musicals in regional theatres. She entered an MTV reality show contest, "Making the Band 3," succeeding in the formation of the platinum selling group, Danity Kane; the first female group in Billboard history to have both their debut and sophomore albums enter the main charts at No. 1.

O'Day has traveled the world serving international charities, and recently founded an AIDS educational charity, F.A.N. and a clothing line, heartonmysleeveshop.com.

George Wendt stars as Edna Turnblad in the Tony Award-winning Best Musical.

In Hairspray, "it's 1962—the '50s are out and change is in the air," according to the producers. "Baltimore's Tracy Turnblad, a big girl with big hair and an even bigger heart, has only one passion — to dance. She wins a spot on the local TV dance program, 'The Corny Collins Show' and, overnight, is transformed from outsider to irrepressible teen celebrity. But can a plus-size trendsetter in dance and fashion vanquish the program's reigning princess, win the heart of heartthrob Link Larkin, and integrate a television show without denting her 'do?" Hairspray is based on the New Line Cinema film written and directed by John Waters. It features a book by Mark O'Donnell and Thomas Meehan, and a score by five-time Academy Award nominee Marc Shaiman and lyrics by Shaiman and Scott Wittman.

Hairspray is directed by Jack O'Brien and choreographed by Jerry Mitchell; scenic design is by David Rockwell; costume design is by William Ivey Long; lighting design is by Kenneth Posner; and sound design is by Steve C. Kennedy.

For more information, visit www.hairsprayonbroadway.com.