Celebrity friends and family of the four-time Olympic gold medalist flooded the comment section, cheering on the tennis star's surprise appearance. Former NBA star Dwyane Wade commented fire emojis, while Serena Williams' sister Venus Williams commented "You did that!!! 💙✨"

The tennis star, who made a surprise appearance during Kendrick Lamar’s halftime performance, posted behind-the-scenes photos from her rehearsals

Williams’ appearance in the halftime show is also raising eyebrows because Lamar brought her out on stage during a song that’s commonly known as a diss to Drake. Lamar and Drake feuded over the years, culminating in a series of diss tracks about one another last summer — and a lawsuit.