Bill Belichick, numerous Patriots attend Celtics-Pacers Game 2

Bill Belichick is shown on the center-court video board at TD Garden. –Nicole Yang for Boston.comAmid his pre-draft prep, Patriots coach Bill Belichick stopped by TD Garden to take in Game 2 of the Celtics-Pacers first-round playoff series.

A frequenter of Boston sporting events, Belichick, who turned 67 years old on Tuesday, was joined by his longtime girlfriend Linda Holliday. The couple sat courtside, next to Celtics co-owner Wyc Grousbeck and his wife Emilia Fazzalari.

In between the first and second quarters, Belichick, wearing jeans and a suit jacket over a light blue button-down shirt, cracked a smile upon being shown on the center-court video board. He, of course, was showered with…