Knicks fans couldn’t help but show pure jubilation after their team’s Game 5 win on Tuesday night, and that included Spike Lee chanting “Knicks in six” and supporters taking over the streets outside Madison Square Garden.

It mirrored scenes that have occurred all playoffs long, as supporters went wild after the 121-91 victory over the Pacers to put the Knicks ahead 3-2 in the best-of-seven second-round series.

As fans poured onto Seventh Avenue, chants of “We want Boston!” could be clearly heard by the large blue-and-orange-clad contingent.

Spike Lee reacts courtside during the fourth quarter.Charles Wenzelberg / New York Post

In another clip, Knicks superfan — and famed director — Lee hyped up the crowd as he exited the Garden.

“Knicks in six!” Lee exclaimed as he walked out of the building, appearing to high-five fellow fans lined behind a security barrier.

The mood outside MSG could easily be described as exuberant as Knicks fans basked in the win and claimed complete confidence in their team going into Game 6.

“I’m never worried for Game 5!” one fan exclaimed to The Post’s Brandon London. “Because the Knicks are the best team in the nation!”

“Bro we hustlin’ and we hustle every play,” another fan said. “We play with our hearts. [The Pacers] don’t play with their heart. They play for the fame and the money. We play for heart. We play for culture. We got Josh Hart. We got Jalen Brunson.”

The fan added: “I don’t know what else to say, bro, just Knicks in six.”

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Spike Lee was excited for the Knicks’ win in Game 5.

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One Knicks fan who talked to The Post was amped up.

Brunson scored a game-high 44 points for the Knicks on 18-of-35 shooting, and Hart ended the night with 18 points and 11 rebounds while shooting 43.8 percent from the field.

Alec Burks also had 18 points in the Knicks victory, while Isaiah Hartenstein had a game-high 17 rebounds — and tied a Knicks playoff record with 12 offensive boards — against Indiana.