The Duke of Cambridge returned on the second part of the BBC special to help work on a new community centre.
From their Lindo Wing debut to the Cambridge children's tours abroad, take a look back at some of their most memorable fashion moments.
From £1 million travel bills to £30 million security bills, royal spending appears to be at an all-time high - and it's time we had a conversation about it, say royal experts.
"Already you can see in George, a little bit of unsurety, a little bit of uncertainty and a small bit of resentment towards all the cameras."
From meeting Barack Obama in his dressing gown to his role at the royal wedding, take a look through Prince George's seriously adorable photo album.
The royal famously wore a 'pretzel' hat by Philip Treacy to the Duke and Duchess of Cambridge's wedding in 2011.
Child psychologist Emma Kenny says William and Kate will let their son make up up his own mind about whether he wants to remain embroiled in royal life.