The home side got off to a dream start after a nightmare pass from Joao Gomes gifted the ball to Yamal.
The Spaniard steadied himself and curled a stunning strike past Zion Suzuki to give Barcelona an early advantage.
As the rain poured, Aston Villa tried to steady the Barcelona pressure, with Prince William and Prince George watching on.
The Villains created a couple of half-decent chances in the first half, with Matty Cash coming close.
