On Tuesday evening, it became official. After Celtics star Jayson Tatum was injured on Monday night in the team's Game 4 loss to the Knicks at Madison Square Garden in ther Eastern Conference semifinals series, there was ample speculation that Tatum had suffered an injury to his Achilles tendon.

Achilles injuries to Damian Lillard and Tatum are going to alter teams built to contend.

Instead, the Celtics were able to save their season with a 115-93 victory in the pivotal game.

Chalamet, 29, sat courtside with his girlfriend Kylie Jenner on one side and her sister Kendall on the other.

Chalamet’s visible passion for the team lit up social media, especially after a second video posted by SportsCenter showed him exchanging an energetic handshake with Knicks star Karl-Anthony Towns.