The Duchess of Cambridge is already juicing to regain her royal figure after recently giving birth to baby Princess Charlotte. It looks like having a 22 month old son- Prince George, and a most recent addition to the royal lot prods Kate Middleton to keep the motherhood weight gain at bay.

According to Express, The Duchess of Cambridge has been a fan of natural fruits and vegetable juices even before her wedding to Prince William in 2011. Her inclusion of healthy juices in her diet actually helped her slim down for the royal wedding. In just four weeks, her size dramatically changed  and dwindled down to a small size 6.

The British press has even nicknamed Middleton "The Smoothie Queen"

Express also revealed the posh kitchen gadget the Duchess is using to make her juices. The 33 year old is using a Nutribullet extractor, a mini blender that can completely break down ingredients "to their most nutritious and absorptive state, meaning you get the maximum nutrition your body needs."

Kate Middleton does her daily juicing regimen to stay fit and have that royal figure in check with the help of her sister- Pippa Middleton. Pippa is currently studying to become a nutritionist..

"Pippa arranged to have fresh juices delivered to Kate every three days," says a family source. "It was a surprise treat. Kate used to blend her own juices and this is much easier."

According to US Weekly, his royal higness Prince William, is also an avid convert to the juicing regimen. According to the source. "Pippa was the one who got them into juicing. They all love it! "

Middleton frequents the "Back to the Garden" , a local organic farm shop near the tiny Norfolk village of Anmer. "She's buying fresh local produce," says a source.