Estelle Harris passed away of natural causes at the age of 93.

She was best known for playing Mrs. Costanza on “Seinfeld.”

Comedian Jason Alexander played her son, George Costanza.

Shortly after her death, he took to Twitter to post a statement.

“One of my favorite people has passed - my tv mama, Estelle Harris,” he began.

“The joy of playing with her and relishing her glorious laughter was a treat,” he added.

“I adore you, Estelle. Love to your family,” he wrote. “Serenity now and always.”

Harris appeared as Mrs. Costanza on 27 episodes of “Seinfeld” from 1992 to 1998.

She first appeared in “The Contest” when she walks in on George losing the contest!