It's not always easy being besties, just ask Ed Sheeran and Taylor Swift.

Yes, they gift each other decorative plates and needlepoint crafts, but there was a time they didn't quite see eye-to-eye, and it just so happened to be during the process of making their guitar-ballad duet, "Everything Has Changed," off Taylor's Red album.

"I went to her house, she cooked an apple pie -- she cooks really good sh--," Ed told BBC Radio 1 Host Zane Lowe for the MTV UK show "Soundchain." "She has a little Taylor guitar, she got it out and she's like, 'I had this idea for this song,' ... and she pretty much had the verse, bridge and chorus done, but we argued about that one chord -- 'I just want to know you, better know you' -- she didn't like that, and I kind of forced it upon her."

And that's when things got a little awkward between the two friends.

"It was quite a funny situation. It's like [her room is] surrounded by Grammys; she has like seven or eight and like Billboard Awards and Songwriting Guild," he said, "And I'm like, 'this chord,' and she's like [pointing to her awards]."

But all's well that ends well, and the song went on to peak at #32 on the Billboard Hot 100, was performed countless times while Ed accompanied Taylor on her Red Tour and sparked the beginning of our favorite pop-star friendship.