Pablo Picasso's 'joyful' portrait of daughter sells for £18m at Sotheby's

Maya Ruiz-Picasso was born on 5 September 1935 in secrecy to Pablo Picasso’s mistress and greatest love Marie-Thérèse Walter, while the artist was still married to his first wife, former ballerina Olga Khokhlova. Picasso's portrait of her was once owned by Gianni Versace.