Kate Middleton is enjoying a healthful treat of green juices since sister Pippa Middleton began sending her deliveries of the fresh juices every three days. Pippa Middleton arranged to have the juices delivered to the Duchess of Cambridge as a treat, Us Weekly reported Wednesday.

The source revealed that the Duchess previously blended her own juices but the deliveries have made things easier for her. The source further mentioned that Kate has been drinking the healthful concoctions not as part of a diet plan or program, but simply because she enjoys drinking green juice in the morning. “It's Kate's go-to for an extra boost," the source adds.

The 33-year-old mom to new royal baby Princess Charlotte has been drinking smoothies and natural fruit and vegetable juices since 2011. The British media even dubbed her the "Smoothie Queen" for her reported love of making the healthy potions using a Nutribullet blender, Independent.ie reported this month. 

This healthful practice helped Kate slim down before her royal wedding in 2011. Daily Express reported last month that Kate remains a fan of juice diets even though she’s not following the same rigorous regimen she did years back. 

It also seems that Kate became a health freak and has been receiving various health tips from sister Pippa. Even Prince William has been converted into drinking the healthful juices, thanks to his 31-year-old sister-in-law. “Pippa was the one who got them into juicing. They all love it,” a source tells Us Weekly.