Ed Sheeran, Massie Peters surprise fans with 2017 hit song

Ed Sheeran and Massie Peters surprised fans in Australia with an unexpected performance.

The A Team singer help boost the My Favourite Ex crooner’s career, through his label support, song writing collaboration and tour exposure.

The Perfect hitmaker made an appearance on Peters' Wednesday show in Melbourne to perform a duet of his 2017 hit song, Castle on the Hill.

The History of Man songstress shared the reel on her Instagram post and wrote on it, "singing with my boss [ed sheeran] <3."

Expressing her gratitude towards the Photograph singer she wrote in the caption, "Still remember watching you play this one all 60 something gigs we did together, and it was so magical getting to join you on it for one. The best to ever do it."

Peters is currently on her Before the Bloom Tour in Australia and is set to release her third studio album Florescence in May.

Meanwhile, Sheeran is in Australia for his Loop Tour and will make his next stop in Dominican Republic on May 9.

RELATED: Ed Sheeran delights fans with acoustic version of 'A Little More'