Serena Williams is a Swiftie! The tennis legend took to Instagram Saturday, Oct. 19 to post a video of herself dancing at one of Taylor Swift’s Eras Tour shows in Miami, Florida. “Oh, just a casual Swifty over here (maybe not so casual) @taylorswift,” the 43-year-old captioned her video. It was a family affair for the star athlete, as her husband Alexis Ohanian also uploaded photos from the concert with their daughter Olympia, revealing that it was the 7-year-old’s first concert! “I’m a Swiftie now. Amazing experience. Fantastic performance. Olympia’s first ever concert will be VERY hard to top. Thank you, @taylorswift,” he wrote for his caption. Many other celebrities also flocked to the global superstar’s shows in the “sunshine state,” which ran from Oct. 18-20, including Tom Brady, Hoda Kotb, Savannah Guthrie, Ashley Tisdale, Dave Portnoy, Jason Kelce, Kylie Kelce, and Donna Kelce. The pop star wraps up her Miami concerts after a final performance tonight, Sunday, Oct. 20.