Hollie Smith has debuted a heartfelt song written about and dedicated to her "best friend" Helena McAlpine.

McAlpine, a well-known Auckland TV presenter and personality, died in September last year at the age of 37 after a long battle with breast cancer.

Kiwi songstress Hollie Smith today released a song called Helena, "a tribute to Hollie's best friend who sadly passed away after a long and courageous battle with breast cancer".

The video opens with a note saying Smith wrote the song with McAlpine's husband Christopher Barton for their wedding ceremony in December 2014.

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"I managed to finish recording it on the evening of September 22 2015 and I played it to her the next morning," the note says. McAlpine died the next day.

The note ends with the message: "I lost my best friend."

- nzherald.co.nz