Popstar Jessie was performing at the Open Air Theatre in Scarborough on Wednesday (25 June) and surprised fans after bringing Leah on stage to sing 'Price Tag'.
The 26-year-old, who was a coach on the BBC One talent show during Leah's stint as a contestant in 2012, later posed for a quick photo backstage.
Jessie, who wore a nude two piece by Pam Hogg for her stage performance, said: "@leahmcfallmusic It's amazing to have seen you audition for The Voice to now releasing music, performing at your own shows and getting to invite you on stage to sing Price Tag! You are amazing!
"Your range amazes me every night! THANK YOU for being an incredible support! #girlpower."
Jessie then told fans to purchase Leah's new single, 'Home', which features her mentor will.i.am. Northern Irish singer Leah, who came in second place during series two of The Voice UK last year, is hoping to get a chart hit with her new single.
Leah unveiled the music video for 'Home' yesterday. The single is due for release on 27 July.
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Watch Leah McFall's 'Home' featuring will.i.am in the video below: