"It's like if someone stops me, it could go either way. I could be Ed or I could be me," he continued.
According to Grint, even celebrities believe he's Sheeran as he shared a story about an encounter he had with singer Leo Sayer.
"Leo Sayer, he came up to me and he said he loved my music," Grint said. "Of course, thinking I was Ed. I just, yeah, I play along."
Previously, Grint appeared in the music video for Sheeran's single "Lego House."