The adorable duo cheered on the home team from their courtside seats, with Quinlin even rocking a Knicks baseball tee and matching royal blue kicks.
Ben -- who is also dad to 14-year-old daughter Ella with wife Christine Taylor -- had some grown-up company as well. While Quinlon sat on his left side, he was joined by Chris Rock on his right.
Madison Square Garden was filled with even more famous faces for the Martin Luther King, Jr. Day game. Val Chmerkovskiy and Amber Rose were spotted getting cozy, while Ansel Elgort and his girlfriend, Violetta Komyshan, both rocked Knicks jerseys.
All that star power didn't help the Knickerbockers rocket to a win, however -- they narrowly lost to the visiting Atlanta Hawks 108-107.
Ben has been a familiar face at the Garden this NBA season. He also sat courtside with Quinlin and Chris at the Knicks' game against the Oklahoma City Thunder on Nov. 28, and he made the Nov. 14 game against the Dallas Mavericks a date night with Christine.