Dianne Buswell has treated her Instagram followers to a sweet throwback photo from her childhood after she was asked to unveil her natural hair colour.During a long train journey with her boyfriend Joe Sugg on Wednesday night, the Strictly Come Dancing star took part in an impromptu Q&A session, and was asked "What is your natural hair colour?"MORE: Dianne Buswell and Joe Sugg leave fans in stitches with hilarious snapWATCH: Dianne Buswell receives sweetest gift from Joe Sugg after Strictly