The dance competition/reality show is turning out to be can't-miss this summer. In addition to the better-than-ever dancing, a super-stylish host (we love you Cat Deeley!) and unpredictable, endearing judge Mary Murphy ("I can't [raise my eyebrow] anymore because of Botox!"), now megastar Katie Holmes is rumored to be making a cameo: She's been spotted at the TV studio in dance clothes, she made a guest appearance as a dancer on Eli Stone last year, she's sporting new extensions, and our sources tell us she's a huge fan of the show. Maybe it's a coincidence, but we'll certainly be tuning in!