The 32-year-old tennis superstar was a cat in high spirits after jetting promptly to Miami alongside fellow tennis star, Caroline Wozniacki.
The pair hit the beach in Miami, Florida, on Saturday, May 31, and while hanging out, stumbled upon a beachside wedding.
Williams not only crashed the nuptials, but she did it while wearing a leopard print swimsuit.
Guests could help taking photos while the happy couple seemed to be thrilled to have her there.
She later posted a picture on Instagram with the smiling bride and groom under the caption “Wedding crasher!! Congrats!”