American girl band Fifth Harmony are the latest act to join Taylor Swift for a guest spot on her ‘1989’ world tour.

In what has become a custom part of Swift’s current live shows where she duets with surprise guest stars, the ‘Bo$$’ group performed live with Taylor at her Santa Clara, California gig.

Fifth Harmony, made up by Camila Cabello, Dinah Hansen, Lauren Jauregui, Normani Hamilton, and Ally Brooke, made Taylor Swift an honorary sixth member as they all teamed up for a special rendition of their hit single ‘Worth It’ (see video below).

All dressed in matching blue and sequin ensembles, 25-year-old Swift performed the ‘Worth It’ choreography and joined in with a few lines of the song.

Following the concert, Taylor took to Twitter to say: “I want to be in Fifth Harmony’.

Taylor Swift’s ‘1989’ tour continues tomorrow night (August 17) at the Gila River Arena in Glendale.

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Watch Fifth Harmony and Taylor Swift performing ‘Worth It’ below: