Taylor Swift has now been added as an official songwriter on Calvin Harris' 'This Is What You Came For'.

The singer was previously credited as Nils Sjöberg on the hit track.

However, TMZ report that the US star has now been added to the list of credits by her real name.

Swift's surprise participation in the Rihanna collaboration was revealed by ex-boyfriend Calvin Harris recently on Twitter.

The singer meanwhile spent Monday (July 18) in the headlines after Kim Kardashian leaked clips of a phone call she had with Kanye West.

The conversation concerned the rapper's controversial song 'Famous'.

Swift took to Twitter to accuse Kardashian of "character assassination" after revealing that she was never given the chance to her the song, which called the singer a "b*tch".

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Watch the video for 'This Is What You Came For' below: