It takes quite something to upstage a championship-winning basketball team, but Sydney Sweeney managed it rather effortlessly. The Euphoria star turned up courtside for Game 5 of the NBA Finals on Saturday night, sent the internet into a spin, prompted a priceless live reaction from Charles Barkley — and then got absolutely roasted by fans who noticed her jersey appeared to be on backwards.

Barkley Loses It Courtside

As ESPN's Inside the NBA cut to the crowd during Game 5 between the New York Knicks and the San Antonio Spurs, the cameras landed on Sweeney, 28, sitting among a galaxy of A-listers at Frost Bank Arena. NBA Hall of Famer Charles Barkley could barely contain himself.

"Is that Sydney Sweeney? Everybody's a New York Knicks fan now," Barkley blurted out live on air, sounding genuinely gobsmacked.

The clip went viral almost instantly, with fans revelling in Barkley's barely-disguised delight. It was, as many viewers pointed out, the perfect encapsulation of just how packed the Knicks bandwagon has become during this historic Finals run.

The Jersey That Had Everyone Talking

Sweeney had gone all out for the occasion, sporting a personalised Jalen Brunson jersey-style T-shirt — number 11 — paired with denim and a blue and orange Knicks jacket. Sweet, dedicated, very on-brand. There was just one small issue: supporters were quick to point out that she appeared to be wearing the shirt backwards, with Brunson's number displayed on the front rather than the back where it belongs.

Sydney Sweeney in a New York Knicks jersey takes a selfie while surrounded by fans at what appears to be a basketball game.

Some fans weren't just poking fun at the wardrobe moment — they were genuinely nervous. "Knicks are losing," wrote one superstitious supporter beneath a photo of her. "Spurs are winning," echoed another. Thankfully for Sweeney, the Knicks didn't get the memo, pulling off a 94-90 victory to clinch their first NBA championship in 53 years.

A Couple's Championship Moment

Sweeney wasn't flying solo for the occasion. She was accompanied by her boyfriend, music manager Scooter Braun, 44, who has been visibly swept up in the Knicks fever alongside her. The pair had already attended Game 4 together at Madison Square Garden — where they were seated just rows behind Taylor Swift — and Braun later revealed on Instagram that Sweeney had surprised him with tickets in the same section as his father and brother.

Sydney Sweeney and Scooter Braun pictured together in a crowd at a New York Knicks game.

"Still buzzing and haven't slept all night as that was one of the greatest nights of my life," Braun wrote after that earlier match. "That is what sports and basketball are all about. It brings people together."

At Madison Square Garden, Sweeney had turned heads in a Knicks windbreaker paired with bespoke vintage Manolo Blahnik heels featuring a miniature basketball charm — a rather more polished look than the backwards jersey outing that followed.

Star-Studded Stands

Sweeney was far from the only famous face packing out the arena for Game 5. Ben Stiller, Timothée Chalamet, Spike Lee, Tracy Morgan, and Knicks legend Patrick Ewing were all spotted in attendance, adding to the sense that this was as much a cultural moment as a sporting one. For celebrity watchers, the NBA Finals has been the gift that keeps on giving.

Ben Stiller, Tracy Morgan, Spike Lee, Timothée Chalamet and Prince Harry pictured separately in a crowd at a New York Knicks game.

In between the basketball circus, Sweeney had also found time to pop up in Los Angeles on Friday for a promotional event for her Syrn lingerie brand, dressed in a blue-and-white ensemble complete with a Must de Cartier watch. Whether the jersey was on the right way round at that one, we can only assume so. Either way, the Knicks are champions — and Sydney Sweeney, backwards shirt and all, was there to see it happen.