Lionel Messi scored two first half penalties to put Barcelona into the ascendancy and Andres Iniesta scored a third to clinch victory and a spot in the Champions League semi-finals.
Barcelona 1-0 AC Milan (Messi)
Barcelona 1-1 AC Milan (Nocerino)
Barcelona 2-1 AC Milan (Messi)
Barcelona 3-1 AC Milan (Iniesta)