By Jennifer Newton The Princess of Wales has shared a new photo as she marks Mother’s Day with her children and recovers from surgery. Mum-of-three Kate posted a never-before-seen picture of herself with Prince George, Princess Charlotte and Prince Louis on Sunday morning. The sweet snap was taken in Windsor earlier this week by the Prince of Wales. In an accompanying message Kate thanked the public for their “kind wishes and continued support over the last two months” and wished people a Happy Mother’s Day. The King also posted a touching photo of himself and his mother, the late Queen Elizab…