Messi pipped Netherlands and Liverpool defender Virgil van Dijk to the most prestigious individual prize in football, while longtime rival Cristiano Ronaldo - a five-time winner of the accolade - finished third.
Messi had arrived at the glitzy bash at Théâtre du Châtelet in Paris with his wife Antonella Roccuzzo and two of his three sons, Thiago, 7, and Mateo, 4.
And when Messi was announced as the winner of the award by French legend Didier Drogba, one person in the crowd who couldn't contain their delight was young Mateo.
He was seen bouncing up and down in his chair laughing as Messi took to the stage - although his brother Thiago seemed far less impressed.
Despite his tender years, Mateo has already established a reputation as quite the character. Messi previously revealed how he trolls his elder brother by celebrating goals AGAINST his dad's team - although he has at least mastered Messi Sr's iconic celebration.Also on rt.com Chip off the old block! Mateo Messi adopts dad's trademark celebration in adorable VIDEO