A source in attendance at the Reading wedding Taylor Swift attended over the weekend has shared some details about the star's night.

Swift, a Berks County native, was at Berkshire Country Club on Saturday to attend the wedding of Britany Maack and Benjamin LaManna. Swift was Maack's maid of honor.

The source, who asked to remain anonymous, shared the following details:

Swift ordered an old-fashioned on the rocks.

When the cover band performed "Shake It Off," Swift ran to the stage to join them.

At the end of the night, Swift performed "Shake It Off" again and "Blank Space."

“I’ve never been a maid of honor before,” Swift told People in May 2015. “This is my first time, and it’s really, really important to me because this is my best friend, who I’ve known since I was born. And she’s marrying someone I’ve known since I was 4.