Gwen Stefani paid tribute to a very special person on Instagram on Friday when she shared a heartfelt post remembering him. The No Doubt singer wrote an emotional message on social media to thank her songwriting pal, Busbee, for everything he did for her before he tragically died. MORE: Gwen Stefani opens up about her children's dyslexia in rare interview The music producer sadly passed away last year at the age of 43 and left his beautiful young family behind. WATCH: The Gwen Stefani and Blake