The Reds left-back penned a fresh deal after an opening 18 months of constant progress since joining the club from Hull City.
"Over the moon," were the words Robertson used to describe his delight with the development - as you can see in the gallery of pictures below.
Get the new white colourway of the official 2018-19 New Balance training range at liverpoolfc.com/store from 9am GMT on January 18.