The US country singer has collaborated with the British singer-songwriter on the track 'Everything Has Changed'.
"I was really excited about getting to work with Ed Sheeran because I love his songs so much — they're so beautiful," she told The Sun.
"So when we ended up doing a duet, I was just so happy to have his voice on the record."
Swift explained that the pair hung out at her Los Angeles home into the early hours, and that other songs are likely to be released in the future.
"We had both reached out to each other's camps at the same time. I showed up at his hotel in Arizona and we just wrote songs all day.
"Then he came and hung out at my house in LA and we spent all night sitting on the kitchen floor laughing, writing songs and harmonising.
"We have made other songs and we will put them out at different times."
When asked if she has recently been left starstruck, she said: "I met Ellie Goulding at The Jonathan Ross Show and she's such a cool girl. Plus, she sang at the Royal Wedding."
Taylor Swift has named Imogen Heap as a future "dream collaboration".
Red is now available in the UK and is released today (October 23) in the US.
Watch the music video for Taylor Swift's 'We Are Never Ever Getting Back Together' below: