Taylor Swift embarrassed her best friend Abigail Anderson at her wedding on Saturday (02Sept17) by recalling a raunchy moment between the bride and groom during her speech.

The Bad Blood singer was a bridesmaid at her longtime pal's nuptials in Edgartown, Massachusetts, and following the ceremony, she gave a toast to the bride and her new husband Matt Lucier which left some guests blushing.

Captured on video and posted via Instagram on Monday (04Sep17), Swift described a lusty liaison between her pal and her then-boyfriend in a restroom.

"She's running after him, there's falling, there's stumbling," the star revealed. "They make it to the bathroom, and I hear sounds that I can never unhear."

The hitmaker and Anderson have been friends since they met in high school. She referenced her longtime pal in the hit song Fifteen.