Aaron Carter, the blond heartthrob of the barely-teen set, will jump into Seussical, the Broadway musical, March 30, five days earlier than announced, a spokesman said.

The 13-year-old international star, known for such songs as "Crush On You" and "Crazy Little Party Girl," will play the lost kid, JoJo, who feels "Alone in the Universe" in the Lynn Ahrens-Stephen Flaherty tuner drawn from the works of Dr. Seuss. He was originally announced to start April 4. He stays with the troupe at the Richard Rodgers Theatre to May 6. Cathy Rigby joined Seussical, playing The Cat in the Hat, March 15 and continues indefinitely as the acrobatic feline.

Carter began his singing career at age 7 when he sang with Dead End. He has since been dubbed The Little Prince of Pop. His albums include "Aaron Carter" and "Aaron Carter: Come and Get It." He first got a break when performing during a Backstreet Boys concert; he later toured with Britney Spears.

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SFX Theatrical Group, Barry and Fran Weissler and Universal Studios are producers of Ahrens and Flaherty's Seussical, the family-friendly show that has been in need, critics and producers agree, of star names to sell tickets and help anchor the expansive narrative. It opened in November 2000. Frank Galati is credited as director, though his work and the work of choreographer Kathleen Marshall was augmented by director-choreographer Rob Marshall.

Aaron Carter's official website is at www.aaroncarter.com.

For tickets to Seussical, call (212) 307-4100.