Taylor Swift is officially in her Disney Era as of this week, starting with Friday’s release of “I Knew It, I Knew You” for Toy Story 5 and followed by her surprise debut performance of the song at Tuesday night’s (June 9) world premiere of the movie in Hollywood.

Once the Disney Pixar film wrapped up in front of 3,000-plus lucky moviegoers at the Dolby Theatre on Tuesday night, the screen lifted to reveal Swift in a floor-length butter-yellow gown sitting at a piano, ready to live-debut the song the audience had just heard over the film’s end credits. Swift’s vocal perfectly matched the playful country-pop recording, while the acoustic piano backdrop brought some extra emotional weight to the song — especially after the crowd had just audibly sobbed together over Cowgirl Jessie’s poignant Toy Story 5 storyline.

“I would just love to say, it means the world to me to be a small part of the universe of these films, and Toy Story 5 is my favorite of all of the Toy Storys,” Swift told the crowd after performing her new song. “I’m so lucky that I get to be a part of this, and I want to thank … all of the creators at Disney and Pixar for all the work they put into this film. It’s insanely beautiful. It’s a masterpiece. We’re so lucky to get to have this film out. Your work is amazing, and I hope you’re all so proud of yourselves. If you’re in this room and you worked on this film, thank you so much.”

But somehow, the surprise first performance of Swift’s new song was just part of the story. Billboard was inside the world premiere ahead of the film’s July 19 arrival in U.S. theaters, and below are some of our favorite moments from a very special night.