Serena Williams hit the stage with Taylor Swift at The 1989 World Tour show in Hyde Park on Saturday night. Which other WTA stars were there? Watch the video here!
WTA Staff

LONDON, England - One of the biggest stars in the world, Taylor Swift, was at Hyde Park for the latest stop on The 1989 World Tour - and the WTA's leading lady, Serena Williams, hit the stage too:

Williams wasn't there alone - BFF Caroline Wozniacki was also there and they tweeted away after:

And Williams and Wozniacki weren't the only WTA stars who turned into Swifties for the night...