Katie Holmes will perform a song-and-dance tribute to Judy Garland Get Happy from the musical Summer Stock tonight at the Fox TV network show So You Think You Can Dance at 10:00 p.m. EDT.

Holmes, who said to be very excited about the performance worked for the number with choreographer Tyce Diorio and show producer and judge Nigel Lythgoe who directed it.

The performance is expected to be a fun, spicy Broadway number, according to Kherington Payne one of Season Four's top 10 dancers who has worked with Diorio, MTV reported today.

Diorio has previously said Holmes is amazing in the number and has described it as intense and uplifting.

“The thing that is so awesome is that you won’t know, you don’t know what to expect … but then when you sit and watch it, it’s amazing, Diorio told E! Online weeks ago.

Holmes' appearance will introduce the Dizzy Feet Foundation, a charity founded by judge Nigel Lythgoe and co-founded by Holmes that will give dance scholarships to talented underprivileged youth.