So Katie Holmes thinks she can dance -- and in
few weeks, she'll display her moves before a discriminating
audience.

Nigel (NY'-juhl) Lythgoe (LIHTH'-goh), who is the producer of
Fox's "So You Think You Can Dance," confirms the 30-year-old
actress will perform for the reality contest's 100th episode,
airing July 23.

Holmes will pay homage to Judy Garland. In a taped number,
she'll sing and dance to the Garland classic "Get Happy."

Holmes' TV cameo is meant to promote the new foundation she
launched with Lythgoe and "Dancing With the Stars" judge Carrie
Ann Inaba (In-AH'-buh).

The nonprofit, called Dizzy Feet, aims to support dance
education and programs, and talented dancers who can't afford
training.