Serena Williams and Carolina Wozniacki used to compete against each other on the court, but they are good friends. Wozniacki shared a photo on her Twitter account of her and Serena hanging out together. She captioned the photo “girls night.”

Serena shared the same photo on her Instagram Story earlier in the day and captioned it by saying “love you.”

The two former world No. 1 women’s singles players have been friends for several years. Woz even used to do a funny Serena impression on the court.