Ronaldo’s son, the aptly-named Cristiano Ronaldo Jr., walked up to Messi after recognising the Argentina captain and was asked by the four-time Ballon d’Or winner: "How are you doing? How's it all going, good?".
Ronaldo - who has been involved in a direct battle with Messi for the status as the world’s best footballer for the best part of seven years now - then made a surprise confession to his rival.
Ronaldo makes confession to Messi
"He watches a video online, of all of us, and he talks about you", Ronaldo told Messi.
Messi did not respond directly to Ronaldo. Instead he jokingly said to his son: "And now you've gone shy?", as the youngster walked back to be with his father. (The video can be viewed at the bottom of this page).
No bad blood between them
Messi and Ronaldo have been constantly compared throughout their careers - but while the two players’ most fervent fans might not always see eye-to-eye, there has been little to suggest that any bad blood exists between the superstars.
It was reported in November that Ronaldo used an obscene nickname to describe Messi behind closed doors - but the former Manchester United star blasted the journalist responsible for spreading the rumours, which he categorically denied.
Ballon d'Or votes
However, it’s interesting that neither player tends to vote for each other when it comes to the Ballon d’Or. Tactical voting clearly exists - but that neither Messi nor Ronaldo vote for one another adds weight to speculation that they don’t get on.
Messi, as the captain of Argentina, voted for compatriot Angel di Maria, plus Barcelona teammates Andres Iniesta and Javier Mascherano.
Ronaldo, meanwhile, voted for three of his Real Madrid teammates: Sergio Ramos, Gareth Bale and Karim Benzema.
It was the Portugal captain who claimed the prestigious individual accolade for the third time in his career earlier this week. The 29-year-old, who turns 30 next month, now needs one more to draw level with Messi.
Messi, incidentally, finished second in the voting - narrowly ahead of third-placed Manuel Neuer.