Venus Williams co-chaired the Met Gala 2026, clad in custom Swarovski. AFP via Getty Images With seven Grand Slam singles titles and five Olympic medals to her name, Venus Williams is no stranger to serving aces on the court. But when she was tapped to co-chair the Met Gala 2026 alongside Beyoncé, Nicole Kidman and Anna Wintour — following in the footsteps of sister Serena, who co-hosted in 2019 — the tennis legend couldn’t believe it. “When she became a Met Gala co-chair, I thought we’d won as a family. We were all so happy; it was like we all did it,” Williams, 45, told Page Six Style at Raising Cane’s  after Monday night’s ball. After the ball, Venus stopped by Raising Cane’s for a late-night snack. Raising Cane’s “I never thought that would happen — and of course you have to say yes!” the tennis legend told us of being tapped to co-host the ball. courtesy: Raising Cane's “So when I got the call, I was just shocked.…