"Brothers & Sisters" Spoilers #3.12 "Sibling Rivalry"

Regis Philbin and Kelly Ripa guest star as themselves on an all-new "Brothers & Sisters" this Sunday (January 11, 10/9c on ABC).

Kitty (Calista Flockhart) goes public with her tell-all book on an appearance on "Live with Regis & Kelly" (guest starring Regis and Kelly as themselves), but suspects that Robert (Rob Lowe) is keeping a very big secret.

Meanwhile, Sarah (Rachel Griffiths) runs into some serious financial trouble that could keep Greenatopia from making it off the ground, and Tommy (Balthazar Getty) allies with Saul (Ron Rifkin) to push Holly (Patricia Wettig) out of the family business.

Also guest starring in this episode: Nigel Havers as Roger Grant, Eric Christian Olsen as Kyle DeWitt, Will McCormack as Ethan Tavis, Leonard Wu as Christopher Chao and Cotter Smith as Gordon Alexander.