The group took an extended absence from the public eye to write songs for a new album and, during the same period, Pilar had a baby. In 2006, they were joined by Rocío, a fourth sister, and came back as a four girl group to represent Spain in the Eurovision Song Contest 2006. The girls said themselves that Rocío had always been a member of "Las Ketchup", but that had not appeared in the promo material or performances because she was pregnant. They released their second studio album, titled "Un Blodymary". The album release was delayed until the beginning of 2006. They planned to release one million copies and their record producer Queco, who also produced and wrote their worldwide single, "Aserejé", indicated that the album displayed their original sound. Their first single from the album was also titled "Un Blodymary" for the Spanish entry in the Eurovision Song Contest 2006. The song finished twenty-first with only 18 points.