Dallas Harema took his partner, Lucy Ferris, to watch a busking competition when a flash mob broke out and danced in unison to the Bruno Mars song, 'Marry You'.
To Lucy's surprise, her boyfriend then joined in with the dancers, before realising the song was in fact for her.
When the dance ended, Dallas proposed to Lucy in front of a crowd that included members of both of their families.
Lucy responded with an emphatic 'yes'.
Reporter: Mihingarangi Forbes