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Email this Photo 1 of 20 images Next Fall TV: Sexiest Stars Katie Cassidy on "Supernatural" and Laura Vandervoort on "Smallville" (CW) Katie Cassidy and Laura Vandervoort get our vote for superhotties; we're so grateful they're bringing fresh heat to two ongoing series on the CW. Cassidy steams it up in "Supernatural," while Vandervoort comes in as Supergirl for the seventh season of "Smallville." But will Cassidy send teen hearts aflutter like daddy David did in the 1970s? Only time will tell. Gallery: View photos from fall '07 new shows Video: Watch clips from fall '07 new shows  advertisement