Serena Williams won’t let an injured foot get her down — she’s decorated her cast with Swarovski crystals. The tennis great, who underwent surgery after cutting her foot on broken glass, showed off her bedazzled cast at YSL and Vogue’s “Evenings in Vogue” party in Miami on Saturday night. She told us, “I decorated it myself with crystals. I am trying to make the best out of a bad situation. I hope to be out of the cast and back on the court by spring.” Serena joined stars Gerard Butler, Alejandro Sanz and Kelly Rowland at the bash hosted by Market America vice president Loren Ridinger at her mansion.