Portia de Rossi books guest arc on ABC's Scandal.

Portia de Rossi is set to guest star in a top secret arc for Season 4 of ABC's hit drama Scandal. de Rossi's wife, Ellen DeGeneres, tweeted the casting scoop. Check it out below!

I think she's going to be part of B613 as Jake's long lost sister, or she's going to be Olivia's therapist.

Scandal returns Sept. 25 at a new time 9E/8C on ABC!