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\n\tTaylor Swift<\/a> had a lot of fun toying around with her Toy Story 5<\/em> anthem, \u201cI Knew It, I Knew You,\u201d with the singer-songwriter revealing in a new behind-the-scenes clip on Instagram that she wrote, recorded and produced the track with collaborator Jack Antonoff in just eight hours.<\/p>\n \n\t\u201cIt\u2019s been kind of a hectic day,\u201d she tells the camera in the video posted Thursday (June 18). \u201cAt 11 a.m., went to see Toy Story 5<\/em>, got so inspired. Got the songwriter zoomies. Went home, wrote the end credit song for Toy Story 5<\/em>.<\/p>\n \n\t\u201cIt\u2019s 6:57 p.m.,\u201d she continued, cracking up at how much of a whirlwind her day had been. \u201cIn two hours, [then-Disney CEO] Bob Iger and Tom from Pixar are coming to hear it. This is one of the most fun days of my life.\u201d<\/p>\n \n\tSwift also included an adorable throwback photo of herself and little brother Austin dressed in Western-themed outfits, as well as snaps of her at the Toy Story 5 <\/em>premiere earlier in June. \u201cTOMORROW WE GET TS5,\u201d she wrote in the caption. \u201cOh how I love this phenomenal movie. Disney and @pixar\u2019s @toystory 5 is in theaters everywhere tomorrow (!!!!!).\u201d<\/p>\n \n\tFeatured on Toy Story 5<\/em>\u2018s soundtrack, \u201cI Knew It, I Knew You\u201d dropped June 12 and debuted atop the Billboard Hot 100<\/a>. It marks the 14-time Grammy winner\u2019s 15th career No. 1 on the chart.<\/p>\n \n\t\u201cI\u2019ve always dreamed of getting to write for these characters who I\u2019ve adored since I was a 5 year old kid watching the first Toy Story movie,\u201d Swift wrote <\/a>on Instagram when she first announced her involvement in the film, which hits theaters Friday (June 19). \u201cI fell instantly in love with Toy Story 5 when I was lucky enough to see it in its early stages, and I wrote this song as soon as I got home from the screening.\u201d<\/p>\n