By Mandi Bierly
Updated June 20, 2009 at 07:27 PM EDT

Katie Holmes will perform in a “Broadway does Hollywood” number on the August 6 season finale of Fox’s So You Think You Can Dance, E! News reports. A source tells E! she dons a hat, a leotard, and tights for a rendition of Judy Garland’s “Get Happy,” choreographed by Tyce Diorio and directed by Nigel Lythgoe.

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