How did the producers of the Big Bang Theory convince actress Sarah Michelle Gellar to guest star on The Big Bang Theory series finale?

How did the Big Bang Theory producers got her to guest star on the series finale. The show is way beneath her. She is not exactly nerd material. She is way too pretty and popular to be on the series. Her husband Freddie would fit in the series. But not her, because she is too famous and too pretty to appear in... show more How did the Big Bang Theory producers got her to guest star on the series finale. The show is way beneath her. She is not exactly nerd material. She is way too pretty and popular to be on the series. Her husband Freddie would fit in the series. But not her, because she is too famous and too pretty to appear in the series. How did the producers convince to guest star in the finale.
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