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Katie Holmes In 'So You Think You Can Dance'

07/17/2009 05:12 am ET | Updated May 25, 2011

Katie Holmes' will pay homage to Judy Garland for her So You Think You Can Dance performance.

For her routine, the actress, 30, sings Garland's "Get Happy," from her 1950 musical, Summer Stock, a witness at the Monday rehearsal at FOX Studios tells Usmagazine.com.

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