SUNDAY, DECEMBER 14

"VALENTINE" � (8:00-9:00 p.m. ET)

"Act Naturally" (TV-14, L) (HDTV)

ALL THE WORLD'S A STAGE � Tucker Blumsack (Ryan Devlin) runs a struggling theater in Los Angeles. His world is turned upside down when celebutante movie star Vivi Langdon (Holly Valance) crashes into his life� literally. Grace (Jamie Murray), Danny (Kristoffer Polaha) and Kate (Christine Lakin) step in as Vivi's legal team, saving Vivi from jail time and assigning her to community service at Tucker's theater. But as it turns out, these soulmates won't get together without a fight. Tucker doesn't think the infamous party-girl is up to the challenge, and the thought of stage acting bores Vivi to tears. What's a modern day love god to do? Meanwhile, Phoebe's (Autumn Reeser) mistrust of the strange mortal woman who has entered their lives drives her to enlist Leo (Robert Baker) to help her break into Kate's apartment, hoping to find something that will confirm her suspicions. John Putch directed the episode written by John J. Sakmar and Kerry Lenhart (#103).