Best friends Martha and Lucy thought they were recording a version of Ellie's track "Army" for a documentary but were left completely in shock when they were joined on stage by the "Love Me Like You Do" hitmaker, reported Femalefirst.
"It was amazing to surprise Martha and Lucy. They are so talented and nailed some tricky harmonies. I was impressed. 'Army' is about my best friend, so it was great to surprise two best friends. Their reaction was so worth it," Goulding said.