Many are aware that Jennifer Coolidge was on Seinfeld in a guest role, but what they may not know is the cunning and ingenious way she got the part. At one point, Coolidge was probably best known for her role as Stifler's mom in the American Pie movie franchise, but her star somewhat cooled over the years until her resurgence in the White Lotus franchise as the daffy but undeniably lovable Tanya McQuoid. She earned one Golden Globe and two Emmy Awards for her work and rocketed herself back into mainstream stardom.
https://screenrant.com/jennifer-coolidge-on-seinfeld-lied-cast/