Remember that Lakers also won the championship game in the 2009 NBA Finals, which makes them "back-to-back champions" against Celtics.
In the best of seven series, we can all see that the finals match-up is very unpredictable. Here are the results:
Game 1: BOS 89 -- LAL 102
Game 2: BOS 103 -- LAL 94
Game 3: LAL 91 -- BOS 84
Game 4: LAL 89 -- BOS 96
Game 5: LAL 86 -- BOS 92
Game 6: BOS 67 -- LAL 89
Game 7: BOS 79 -- LAL 83