Julio Iglesias' 'secret son' Javier, 40, from Valencia, proves paternity

The as-yet unidentified son – said to be named 'Javier', and half-brother to chart-topping Latin pop sensation Enrique Iglesias – had tried in the past to prove paternity but 'technicalities' meant the suit failed.

He has since brought another case, citing Article 39 of the Spanish Constitution, which protects the rights to paternity investigations for everyone.

A solicitors' firm in Sevilla is handling the case and says the DNA is a 99.99% match, the highest possible, meaning there is 'no doubt' the Valencia man is Julio's son.

The firm, Bufete Osuna, specialises in paternity suits and successfully proved last year that the young bullfighter Manuel Díaz was the illegitimate son of the famous matador, Manuel Benítez 'El Cordobés'.

Julio, 73 (pictured), married to Miranda Rijnsburger for the past seven years, is no stranger to 'surprise' family members appearing – he has a 14-year-old brother conceived when his father was nearly 90.

'Javier' would have been born in 1977, meaning Julio's affair with the Valencia woman was in 1976 – five years into his marriage to part-Philippine model and it-girl Isabel Preysler, mother of Enrique, from whom Julio separated 38 years ago.

Preysler, 66, is now engaged to be married to Peruvian ex-presidential candidate and Nobel Literature Prize-winning novelist Mario Vargas Llosa.