The country starlet surprised fans on her 'Red' tour as the pair launched into a rendition of Emeili's hit 'Next To Me' and Taylor described the singer as ''heavenly.''
She told the crowd: ''I was thinking about playing the O2 and the last time I played it. Do you remember the BRIT Awards last year? I had a great time and I got to meet one of my favourite artists and I watched her clean up at the BRIT Awards. Then I got this idea she could come out and play for you. So what do you think about Emeli Sande coming out to play a song for you tonight?''
The 23-year-old beauty looked emotional as she took to the piano to play 'All Too Well' and tore through a number of other hits before performing 'We Are Never Ever Getting Back Together'.
After the gig, Taylor took to Twitter to thank her fans and Emeli, she wrote: 'Tonight @emelisande surprised our London crowd with 'Next to Me'!! SHE IS SO HEAVENLY. I've had the best time here. Last show tomorrow....'
Taylor is currently performing the UK leg of her 'Red' Tour and her last gig will be tonight held again at the O2 Arena in London.
To coincide with her residency at the venue, the British Music Experience - which is situated inside the O2 - are showcasing select items from Taylor's wardrobe alongside photographs by Christie Goodwin in a pop-up exhibition.
Admission to 'Taylor Swift: A Photo Experience' is included within the price of a museum ticket, and costs just £4 to ticket holders for her O2 shows during the duration of her residency.
The exhibition runs until 23 March.
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