The Best Celebrity Cameos On Dawson's Creek

Dawson, Joey, Pacey, Jen... and a naked Rachel Leigh Cook.

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Jensen Ackles

Before he was on "Supernatural," Ackles stopped by season six of "Dawson's" to play C.J., whom Jen meets in college and has a tumultuous relationship with after he sleeps with -- yep -- Joey's roommate Audrey.