Barcelona were 2-0 down from the first leg in Italy but got off to a fantastic start, as Leo Messi played a one-two with Xavi before curling a brilliant shot past Christian Abiatti.
Messi then scored a superb second goal before half time, albeit from an offside position, to level the tie. David Villa struck a crucial third goal to put Barcelona ahead for the first time and then Jordi Alba wrapped up the win in the last minute.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.