Holly Willoughby has given fans a rare glimpse at her son Chester to mark his sixth birthday.This Morning presenter Holly, 39, posted an adorable photo of her son and made a tribute to him on Instagram. Holly’s snap shows her beloved youngest son standing in front of a Chelsea football team-themed cake, which has a blue football shirt made of icing with Chester’s name on.The two-tier cake has a number of blue stars on top and several lit candles.