(CNN) - When it came time for Ed Sheeran to collaborate with Beyonce, it wasn't as simple as him calling her up.
The "Shape of You" singer talked to Entertainment Tonight about how his duet with Beyonce, "Perfect," came to be.
"I have an email address that I email that actually changes every week," he said of how he communicates with the superstar singer.
That's right. Beyonce probably has better layers of security to get to her than some heads of state.
Sheeran said the plans for the ballad, which dropped last Thursday, have been in the works since May and had a bit of a delay because of a big life event.
"Obviously she had twins and we finished it in September," he said. "I've been holding on it since then."
Sheeran said the two singers collaborated on "Perfect," with Beyonce suggesting the song be stripped down to just acoustic guitar.
The process was "very much a back and forth thing," he said. They eventually recorded the song in about four hours.
And what did he learn from Bey?
"One-take vocals," he said. "She was just like, 'Right,' went in, one take, came out and was like, "Oh, that sounds alright.'"
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