For the second Nashville gig of her ongoing 1989 World Tour, Taylor invited former U.K. The X Factor winner Leona up to perform her 2007 hit Bleeding Love.

Taylor shared her excitement in a post on Instagram.com, writing, "Me losing my mind because @leonalewis is singing 'Bleeding Love' and it's the most glorious, beautiful thing I've ever heard or seen."

She later posted more pictures of the pair on Twitter.com, and captioned the photos, "Oh my God @leonalewis sang 'Bleeding Love' tonight in Nashville and I may never recover."

However, Leona wasn't the only unannounced guest Taylor had in store for fans - she also introduced Rolling Stones frontman Mick Jagger to the stage to belt out I Can't Get No (Satisfaction).

A stunned Taylor simply posted online, "Mick. Jagger. Nashville." She also shared a video clip of the duet with her 64 million Twitter.com followers in the wake of her sell-out gig.

Taylor has been inviting a slew of superstar pals to make special appearances during her tour. She previously hit the stage with Lorde, Jason Derulo, actress Uzo Aduba, and the stars of her Bad Blood video, while fans at her Friday night (25Sep15) gig in Nashville were treated to a rendition of Aerosmith classic I Don't Want To Miss A Thing by frontman Steven Tyler.