Taylor Swift is officially in her Toy Story era, making an appearance at the Toy Story 5 premiere in Los Angeles on Tuesday night. The superstar has an original song , titled “I Knew It, I Knew You,” in the film, which she wrote and produced alongside frequent collaborator Jack Antonoff. Though Swift was not included on the guest list sent to press ahead of the premiere, she hit the carpet ahead of the screening wearing a short neutral-colored dress that featured a floral design. The Grammy winner arrived on the carpet, which took over Hollywood Boulevard in front of the Dolby Theatre, from an area blocked from press and guests. She joined the film’s stars and filmmakers for a group photo as well as with the life-size versions of the iconic characters. After the premiere and screening, Swift also surprised the audience with a performance of “I Knew It, I Knew You” as she played the piano.…