West Wing alum Martin Sheen has joined the cast of Grace and Frankie, Lily Tomlin and Jane Fonda's new Netflix series. The half-hour single-camera comedy stars Tomlin — President Bartlet's former executive assistant— and Fonda as rivals who are shocked to find out that their husbands have fallen in love and intend to marry. Sheen will play the husband of Grace, Fonda's character. No word yet on who will play Tomlin/Sheen's beau, but we wouldn't object if another West Wing-er decided to crash the party. We're looking at you, Alan Alda.