Bundesliga champions Bayern Munich became the first German club to win the coveted treble with a 3-2 win over VfB Stuttgart in the German Cup final in the Olympic Stadium in Berlin on Saturday, dpa reported. Thomas Mueller and a brace by Mario Gomez, gave the Bundesliga champions their 16th German Cup victory - exactly a week after they beat Bundesliga rivals Borussia Dortmund 2-1 in the Champions League final in Wembley Stadium. Stuttgart's goals were scored by Martin Harnik.