Serena Williams’ cameo was one of the many guest appearances in Beyoncé’s visual album Lemonade. She appeared dancing along during the “Sorry” segment.
As reported by the New York Times, Williams recounted how her involvement with Beyoncé and the Lemonade segment began. “I have known the director since I was like nine years old,” Williams said. Presumably, the director she is referring to is Dikayl Rimmasch, who shot video for Bey and Jay Z’s On the Run tour and is known for the black and white visuals. Williams added, “I know Beyoncé pretty well, so they were like, 'We would love for you to be in this particular song. It's about strength and it's about courage and that's what we see you as.'"
As for the directions Beyoncé gave her, Williams continued on:
"She told me that she just wants me to dance, like just be really free and just dance like nobody's looking and go all out. So that wasn't easy in the beginning, but then it got easier. ... I thought that particular song on the visual album was really a strong song, and it was also really fun at the same time."