Hilary Duff returned to the music scene with her 2015 album "Breathe In. Breathe Out." Sheeran helped produce the 10th track, "Tattoo," and made sure to leave his mark on the project.
Unlike a lot of collaborations amongst musicians, Sheeran stepped into the booth with Duff to provide background vocals and such, the former Disney star told MTV News.
"I was really intimidated because, normally, they don't do that, so I kept looking up and being like, 'You're Ed Sheeran and I'm singing the song that you wrote and I want to do right by it,'" she told the publication.
In order to work in the studio together, they had to navigate scheduling conflicts and meet in the middle of the night.
"He had been doing a promo day in L.A. and he's like, 'I know you have a 2-year-old, but could you please come and record at midnight?'" Duff said.
"I was like, 'I've already been in bed for three hours by midnight on most nights,' but of course for him I did, and I'm such a huge fan — he's so talented."