The socialite stars in the Lifetime series as Nikki LePree, a juice-bar hostess turned relationship expert.
According to TV Guide, Kardashian's character will give love advice to Stacy (April Bowlby), with the two later setting up a pie/bakery business.
On how the reality star fared on Drop Dead Diva, Bowlby said: "She was great. She's so beautiful, very professional, knew her lines and was ready to play."
Kardashian is reportedly hoping to concentrate more on her acting career and, according to sources, wants to be "the next Sofia Vergara".
Drop Dead Diva's fourth season will premiere June 3 on Lifetime.