Dolores Aveiro, the mother of Real Madrid star Cristiano Ronaldo, was stopped at Madrid's Barajas airport last month and was caught carrying an illegally large amount of cash as she prepared to fly out of the country, according to reports.
The 60-year-old Mrs Aveiro, who spends long periods of time with her multimillionaire footballer son in his luxury mansion outside Madrid, was held by border police at Barajas after it was found that she had €55,000 in her hand luggage.
The maximum travellers are permitted to take out of Spain without declaring the transfer is €10,000.
Mrs Aveiro had not filled out a declaration form and, according to the Spanish newspaper El Mundo, was held by civil guard agents at the airport for a few minutes while the excess amount of cash was confiscated. She was then allowed to fly to Portugal with €10,000 in her handbag.
Mrs Aveiro will now be fined at least €600 for the attempt to illegally export cash. By paying the fine, she will be able to collect the confiscated €45,000.
The celebrity pages in Spanish newspapers have in the past week been showing photographs of Ronaldo relaxing on board a yacht owned by British retail tycoon Philip Green.
The footballer recently separated from the Russian model Irina Shayk (inset left).
According to Portuguese newspaper reports, Ronaldo and Shayk's relationship was damaged beyond repair last Christmas when they rowed over the player's mother.