Caption this: Gronk, Belichick and Celtics

Bill Belichick, lower left, and Rob Gronkowski, center, took in the Celtics-Heat playoff game Sunday. Jim Rogash/Getty Images

The New England Patriots were out in full force to support the Boston Celtics in their overtime victory over the Miami Heat in Game 4 of the Eastern Conference Finals.

And why not? This series involves two cities that share big rivalries in both the NBA and NFL (Patriots and Dolphins).

Here is a cool photo of Patriots Pro Bowl tight end Rob Gronkowski and head coach Bill Belichick from the game. It appears "Gronk" is being "Gronk" with his new haircut and Belichick is showing off a rare smile.

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