Águeda Isabel Ruiz de la Prada y Sentmenat, 12th Marchioness of Castelldosríus, 29th Baroness of Santa Pau, GE (born 22 July 1960) better known as Agatha Ruiz de la Prada (Spanish pronunciation: ['a?ata 'rwi? ðe la 'p?aða]) is a Spanish fashion designer and aristocrat.