the mother-of-one shed more than three stone using an hypnosis app and dropped from a size 18 to a size ten to 12 in half a year .
the mother-of-one shed more than three stone using an hypnosis app .
andrea hit her target weight in december and transformed her appearance leaving her almost unrecognisable to friends and family .
the bank worker received a curious compliment when her husband 's colleagues thought robbie had traded his wife in for a younger , slimmer model at a christmas party .