The shirtless Real Madrid ace was sitting at a table on the yacht, named aYa London, and looked relaxed as officers carried out the inspection, which is believed to have lasted for around 90 minutes

The Portuguese superstar sits at a table inside the yacht as Spanish customs officers and coastguards boarded and inspected paperwork near Ibiza

According to Spanish newspaper El Confidencial,  the officers from a customs patrol carried out a routine inspection

The Real Madrid attacker wore sunglasses and looked unconcerned as officials boarded the yacht, where he was enjoying an afternoon with his family

Ronaldo's girlfriend, Georgina Rodriguez, was on the yacht when it was boarded by customs officials in a routine inspection. They are believed to have just been out to a restaurant

A man onboard the yacht, believed to be a crew member, is seen covering his face as customs officers walk down the steps of the vessel

Officers wearing black uniforms and contrast made a stark contrast to the skantily-clad sunbathers catching some rays on the deck

The inspection is believed to have formed part of routine checks performed on vessels in the area, related to the paperwork on board to make sure the correct taxes have been paid

The Customs agents, one of whom appeared to be smiling as he left, are understood to have left after discovering everything on board Ronaldo's yacht, named as AYa London, was in order

A curtain was put up around the outside of the yacht to shield it from photographers as officials carried out the inspection

Customs agents are understood to have made their unexpected appearance just off the Formentera shoreline as Cristiano returned from a restaurant with his mother, girlfriend and children including his new surrogate twins Eva and Mateo

An official shakes the hand of a heavily-tattooed man on the yacht, thought to be a family member of the former Manchester United star, who was on board when the inspection took place

The Real Madrid star was enjoying his last few days holiday in the Balearics before the start of his club's pre-season

According to witnesses, the Portuguese international did not get up at any point and remained 'very calm' throughout the inspection

Spanish society magazine Hola reported: 'One of Cristiano's relatives was the person who dealt with the administrative work and showed them the documentation they asked for'

Ronaldo, 32, was on the yacht with girlfriend Georgina Rodriguez and friends and family when the officials approached the vessel

Spanish Tax Agency officials are not expected to make any official comment on the inspection, which was carried out while Cristiano Ronaldo was onboard

Ronaldo is due to attend court at the end of the month to testify as part of an investigation into his tax affairs over claims he may have defrauded £12.9 million by paying insufficient tax over a four-year period. There is no suggestion the inspection was linked to that case

A number of photographers were in the water around the yacht when it was boarded by customs officers close to the coast of Ibiza

Guests of the Portuguese superstar, including family members, continued to enjoy the sun while the inspection was going on, and a curtain was pulled across to protect the footballer's privacy

The boat was boarded off the coast of Formentera in Ibiza, where friends and family had joined the Portuguese footballer on the last few days of his summer break

According to some reports from the scene, there had been complaints about dangerous manouvres being made by the boat's captain by photographers who were following the yacht

A black-clad customs officer is seen stepping down the steps of the yacht during the 90 minute inspection on the football ace's yacht