Kylie Jenner and Timothée Chalamet match in custom Knicks-themed denim for NBA Finals Game 4

Kylie Jenner and Timothée Chalamet are totally in step.

The beauty mogul has become a full-blown New York Knicks fan, joining her boyfriend Timothée Chalamet at Game 4 of the NBA Finals against the Spurs on Wednesday night in matching outfits.

Jenner, 28, and Chalamet, 30, both wore Chrome Hearts jeans customized with blue and orange crosses: his, a baggy pair with the embellishments concentrated around the ankles, and hers a low-slung cuffed style with the patches scattered throughout.

Couples looking to re-create the moment, beware: Similar styles can set you back around $18,000 a pop on the resale market.

They both layered white into their looks, with the Oscar nominee in a plain V-neck T-shirt and the reality star in a simple tank top. Chalamet wore a denim jacket that matched his jeans, while Jenner carried hers.

The Kylie Cosmetics founder carried a white leather Chrome Hearts purse, while her beau brought along his trusty Timberlands.

The couple were joined by BFF Hailey Bieber, a New York state native, who showed her Knicks love in a blue T-shirt — and got the double denim memo, wearing a Canadian tux herself. The Rhode founder pulled her hair up into a sleek and sporty ponytail.

This is Jenner’s first appearance at the NBA Finals, with the “Dune” actor attending solo in San Antonio and at MSG the past three games. In the past, Jenner’s cheered the Knicks to victory in vintage merch, an on-theme blue Hermès Birkin bag and lots of diamonds.

Chalamet, meanwhile, has teamed his swagged-out Chrome Hearts looks with bling of his own.

Game 4 brought a whole slew of other A-listers to the court, including Taylor Swift along with regulars like Ben Stiller and Spike Lee.