News has been pouring out about Lawrence Kasdan's Darling Companion this week. First came the news on Tuesday that Kevin Kline, Richard Jenkins and Diane Keaton were joining the cast, and then Wednesday saw the addition of Mad Men's Elisabeth Moss. Just when you thought the cast couldn't get any better...

A press release has been sent out announcing that that Dianne Wiest, Mark Duplass, Ayelet Zurer and Sam Shepard have joined the cast. In the film, Keaton and Kline play Beth and Joseph, a married couple that is disrupted when Keaton brings home a lost dog that she finds on the side of the freeway. While attending their daughter's wedding in the Colorado Rockies, Joseph loses the dog and Beth, who has formed a strong bond with the animal, gets the guests and a "mysterious young woman" (Zurer) to help her search for it. While searching, each member "is affected by the adventure, which takes them in unexpected directions – comic, harrowing, and sometimes deeply emotional." Outside of Keaton, Kline and Zurer none of the other cast members are given descriptions, but one can assume that they will be playing the other members of the search party.

Check out the full press release about the film below.

WERC WERK WORKS AND LIKELY STORYANNOUNCE COMPLETE CAST FOR “DARLING COMPANION”

DIANNE WIEST, MARK DUPLASS, AYELET ZURER AND SAM SHEPARD TO JOIN KEVIN KLINE, DIANE KEATON, RICHARD JENKINS AND ELISABETH MOSS

Minneapolis, MN and New York, NY (September 24, 2010) – Werc Werk Works, the independent production and finance company helmed by CEO Elizabeth Redleaf, and Likely Story, the New York based production company headed by Anthony Bregman, announced today the complete cast of DARLING COMPANION.

Academy Award® winner Dianne Wiest, Mark Duplass, Ayelet Zurer and Academy Award® nominee Sam Shepard have joined Academy Award® winners Kevin Kline and Diane Keaton, Academy Award® nominee Richard Jenkins and Emmy® nominee Elisabeth Moss in the new film written by Academy Award® nominees Meg Kasdan and Lawrence Kasdan and to be directed by Lawrence Kasdan.

The film will be produced by Anthony Bregman for Likely Story, Elizabeth Redleaf for Werc Werk Works and Lawrence Kasdan. Christine Walker, Meg Kasdan and John Kelly will serve as executive producers.

DARLING COMPANION is the story of a woman who loves her dog more than her husband. And then her husband loses the dog.

On a wintry day, Beth (Keaton) saves a bedraggled lost dog from the side of the freeway. Struggling with her distracted, self-involved husband Joseph (Kline) and an empty nest at home, Beth forms a special bond with the rescued animal. When Joseph loses the dog after a wedding at their vacation home in the Rockies, the distraught Beth enlists the help of the few remaining guests and a mysterious young woman (Zurer) in a frantic search. Each member of the search party is affected by the adventure, which takes them in unexpected directions – comic, harrowing, and sometimes deeply emotional.

Dianne Wiest is a two-time Academy Award® winner (Bullets over Broadway,” “Hannah and Her Sisters”) and will next be seen in John Cameron Mitchell’s “Rabbit Hole” opposite Nicole Kidman and Aaron Eckhart. Mark Duplass is an award-winning writer, director and actor who most recently wrote and directed “Cyrus” starring Marisa Tomei, Catherine Keener and Jonah Hill. Ayelet Zurer was most recently seen in “Angels & Demons” opposite Tom Hanks and “Adam Resurrected” starring Jeff Goldblum. Sam Shepard is an Academy Award® nominated actor (“The Right Stuff”), Pulitzer Prize winning playwright, and director who will next be seen in Doug Liman’s “Fair Game” opposite Naomi Watts and Sean Penn.