Taylor Swift's BFF has a blank space in her bridal party, and the singer happily agreed to fill it!

On Sunday, Swift posted a picture of an adorable card and photo on Instagram. Her best friend Brit Maack had asked the singer to be her maid of honor.

Swift was, of course, more than happy to accept, captioning the photo with an enthusiastic, ''YEAH I WILL."

Maack and Swift have been best friends since childhood. Although Maack's Instagram is mostly made up of photos of her with her fiance, Swift makes the cut every now and then, like when her album "1989" was released in October.

It's safe to say Maack will have some awesome tunes to dance to on her wedding day!

H/T Teen Vogue