Kimberley Walsh has shared sweet photos of her second eldest son Cole as he embarked onto his first day at school.The four year old boy was getting ready to join his brother Bobby, seven, at the same primary school and they were all smiles in their adorable uniform. Posing for their mum Kimberley, 39, the children stood together in the hallway of their family home.There was a giant house plant nearly as tall as Bobby and a white mirror on the wall behind them.