The superstar came off the bench to win the game in the fourth minuted of added time in typical Messi fashion.
He bent a 25-yard free-kick over the wall and into the back of the net – a strike Beckham would have been proud of.
Becks, 48, could not contain his emotion and started welling up, with wife Victoria on hand to embrace him.
He also hugged his daughter Harper who was there to witness the moment of magic alongside her older brother Cruz.
The former England captain then high fived his co-owner Jorge Mas who was also in disbelief at what he had just witnessed.
Messi, 36, sprinted away in celebration with a jubilant look across his face as the crowd went wild.
He embraced his old Barcelona pal Sergio Busquets, who also made his Miami debut, before setting off on a lap of honour.
A-list celebrities in attendance to catch a glimpse of Messi were also left shocked – including Serena Williams and Lebron James.
Reality TV star Kim Kardashian kept Williams company along with her son Saint, seven, who wore a Messi shirt.
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Source: USA Today