Actress Cynthia Watros of the ABC hit show "Lost" is guest-starring in the pilot for CBS' comedy "My Ex-Life," starring Tom Cavanagh.

Watros agreed to fill in the lead female role of the pilot, which was supposed to be played by Gillian Vigman, The Hollywood Reporter said Wednesday.

The show centers on a divorced couple who remain best friends as they share custody of their children, The Reporter said.

Although Watros is being billed as a guest star in "My Ex-Life," it is sure to spin speculation about the fate of her "Lost" character, Libby, The Reporter noted.

Watros has appeared on the CBS soap "Guiding Light," as well as Fox's "Titus" and ABC's "The Drew Carey Show."