Hillary ClintonHillary Rodham ClintonJuan Williams: Trump's budget hurts his voters Is it still possible to stop ‘Big Tech’ from killing democracy? Hillary Clinton for 2020 ‘not a good question,’ says Rahm Emanuel MORE had a surprise visitor stop by her book signing on Saturday: Supreme Court Justice Sonia Sotomayor.

Sotomayor said she was "just shopping" at the Costco in suburban Virginia, where Clinton's book signing was held, and decided to get a signed copy of her new book, "Hard Choices."

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The former secretary of Sate and potential Democratic presidential hopeful shouted that she couldn't believe it, according to the Associated Press.

Clinton released her memoir earlier this week and has been on a media blitz ever since, making stops in New York, Chicago and Philadelphia.

She autographed copies for nearly three hours.