Taylor Swift and Paul McCartney have partnered up.The singers appear together on the cover of Rolling Stone's Musicians On Musicians issue, which was shot by Paul's daughter, Mary, with clothes from his other daughter Stella; the shoot took place in London last month.In the wide-ranging interview, the blonde beauty talked about her boyfriend Joe Alwyn and finding 'normalcy' together as she touched on writing under the nameNils Sjöberg.
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