Kate Middleton's sweet nickname for Prince Louis revealed in touching moment

ok.co.uk:

Prince William and Kate Middleton freshened up for the Big Help Out on Monday, following the fantastic success of Sunday's coronation concert.

Down at a local scout hut, the couple brought out their three young kids Prince George, Princess Charlotte and Prince Louis for some volunteering fun, as workers reset a path, dug a brand-new soakaway, sanded and revarnished the front door, and added planters to the front of the building.

Having missed out on Windsor Castle's musical extravaganza, which at 8.30pm didn't begin until after his bedtime, five year old Louis was allowed to mess around infront of the adoring public, sitting in his dad's lap as he operated a digger's mechanical arm for soil transportation.

After some shovelling and wheelbarrowing, Louis was then treated to a s'more - a melted marshmallow sandwiched between biscuits - which he seemed to enjoy enormously.