Washington, Sep 29 : Pregnant Kate Middleton plans to return to her royal duties after suffering from three weeks of severe morning sickness, it has been reported.

Duchess of Cambridge has been suffering from hyperemesis gravidarum, a condition she also went through during her pregnancy with Prince George, Radaronline.com reported.

Symptoms of the illness could include persistent nausea and vomiting, which could account for the 32-year-old princess' skinny appearance while pregnant.

Prince William recently admitted that Middleton's morning sickness has been "tricky," but both are "immensely thrilled" about expecting their second child. (ANI)