Melanie Blatt has admitted she was left feeling “extremely vulnerable” by her star turn on the Strictly Come Dancing Christmas special as the costume she had to wear “stripped” her confidence.Former All Saints singer Blatt partnered with dancer Kai Widdrington in the festive episode, where she placed second last despite scoring an impressive 36 out of 40 and receiving praise from the judges.Strictly’s Christmas contestants are often cherry-picked for the main series the following year, but Blatt