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Joosten plays Karen McCluskey in the show and will become a series regular for the upcoming seventh season.
"I'm relatable to every family," she told TV Guide. "Everyone has one McCluskey in their family, but not everyone has a gorgeous Housewife."
Joosten, who recently picked up an Emmy nomination, also explained why she chose to submit the episode of Desperate Housewives where Karen discovers she has cancer.
"[I wanted to show] a juxtaposition between the comedy and the drama," she said.
Desperate Housewives returns for its seventh season on September 26 on ABC.
