Robinho netted twice against Cagliari
The club secured the Italian title a week ago when it drew 0-0 away to Roma, and since then played the Italian Cup semifinal away to Palermo.
Ahead of the match, the team went on an open top bus ride through city streets thronged with supporters, before leading a procession to the San Siro.
Once at the stadium, players, their wives and children celebrated in front of the fans on the pitch wearing commemorative T-shirts.
When the match finally started, a brace from Robinho and a strike by Gennaro Gattuso gave Milan a 3-1 lead at the break before Clarence Seedorf added a fourth in the closing stages.
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