Taylor Swift's wedding guest praises 'princess' bridal look

Taylor Swift looked like "a real-life princess" in her custom Christian Dior Haute Couture wedding gown, according to guest Camille Kostek, who attended the singer's New York City wedding to Travis Kelce with longtime partner Rob Gronkowski.

Speaking exclusively to PEOPLE at Sports Illustrated's Beyond the Pitch event in New York City on July 18, Kostek couldn't hide her admiration for the bride's look.

"She literally was like a real-life princess in her custom Dior," the 34-year-old model said of Swift's July 3 wedding attire.

Julia Roberts left Camille Kostek starstruck

While reflecting on the star-studded celebration, Kostek admitted one guest left her especially awestruck.

"Julia Roberts — I absolutely was starstruck. Even thinking about her, I lose my train of thought. She's amazing," she said.

The Sports Illustrated event, held at Cipriani Wall Street, featured performances by 50 Cent and Diplo while bringing together figures from sports, music and entertainment.

Taylor Swift and Travis Kelce kept wedding details private

Although details of Taylor Swift and Travis Kelce's New York City wedding have largely remained private, it has been reported that the couple, both 36, wore custom Christian Dior Haute Couture designs created by creative director Jonathan Anderson.

Swift was accompanied by her brother, Austin Swift, as her man of honour, while Kelce's brother, Jason Kelce, served as best man. Actor Adam Sandler officiated the ceremony.

Rob Gronkowski praised the celebration

Kostek's longtime partner, former NFL star Rob Gronkowski, previously described the wedding as unforgettable.

"It was top-notch. Hats off to Taylor and Trav. The dance floor — that's the one thing — it was popping," he said on The Other Football show.

He also recalled the scale of the event, saying the procession of black vehicles arriving at Madison Square Garden stretched for several city blocks.

Camille Kostek reflects on marriage expectations

In a previous interview with PEOPLE's WAG World digital series, Kostek spoke candidly about her own relationship with Gronkowski.

She admitted she once expected to be married with children by now but said she occasionally catches herself feeling "behind" when comparing her life to earlier expectations.