Portia De Rossi is to guest star in 'Scandal'.

The 41-year-old actress' wife Ellen Degeneres took to her Twitter account last night (23.07.14) to announce the blonde beauty has landed a role in the ABC's hit series.

She tweeted: ''So annoying when people brag on twitter & that's why I'm not tweeting that Portia just signed on to do a top secret arc on ''Scandal''. Oops. (sic).''

Portia will appear in a multi-episode arc in the upcoming fourth season, which will hit screens on September 25, according to E! News.

The 'Scandal' announcement comes just weeks after it was reported Portia had spent the month of May seeking treatment in rehab for drugs and alcohol issues.

The Australian beauty checked into Passages Malibu rehab facility in California following an alleged blazing row with Ellen, whom she married in 2008.

However, the couple have since put on a united front while enjoying a vacation in Croatia last month and are working hard to sort through their marital problems.

A source said previously: ''They've worked out difficulties in the past, and no doubt they're trying to work out any problems right now.''