In St Kitts , or when representing St Kitts in another country , she is known as the Queen of St Kitts and Nevis , Her full official title being : Elizabeth the Second , by the Grace of God , Queen of Saint Christopher and Nevis and of Her other Realms and Territories , Head of the Commonwealth . In Saint Kitts and Nevis , the Queen 's official title is : Elizabeth the Second , by the Grace of God , Queen of Saint Christopher and Nevis and of Her other Realms and Territories , Head of the Commonwealth .