Serena Williams on Her Cameo in Beyonce's 'Lemonade': "I Got Really Sore From Dancing"

Serena Williams -Ladies Singles fourth round- 2016 French Open -Getty-H 2016
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The tennis champion had no trouble keeping the appearance a secret.

Serena Williams had quite the dancing cameo in Beyonce's visual album Lemonade.

Williams, who danced alongside the singer in her music video for "Sorry," said she has known Beyonce "for a long time." She had to keep her cameo and the album a secret for months. 

"If you tell me, 'Don’t say anything,' I won’t say anything," the tennis champion told WSJ Magazine in her cover story interview. Her close friend Caroline Wozniacki said Williams "really kept it a secret" and that she didn't know about the video until she saw it. 

Williams and her sister Venus host a competitive event called the Williams Invitation every year, and one of the competitions is dance routines. Even so, dance lover Williams said that her Lemonade cameo was still a workout.

“I got really sore from dancing,” Williams told the publication.