FX announced Monday that Aniston will guest-star in the season finale of "Dirt," which is scheduled for Tuesday, March 27. She'll play a character named Tina Harrod, the editor of a rival magazine to Lucy Spiller's (Cox) DirtNow. The guest spot will be Aniston's first TV role since "Friends" ended its run on NBC in 2004, as well as the first time she and Cox have worked together since then. "Dirt," which also stars Ian Hart, Josh Stewart and Laura Allen, is averaging 3 million viewers over its first two episodes. Tune in 10 pm on FX Tuesdays.