Taylor Swift's "I Knew It, I Knew You" has reached No. 1 on Billboard's all-format Radio Songs chart, marking her ninth career leader on the ranking. The song, featured in Toy Story 5 and inspired by the film's cowgirl character Jessie, continues a strong run for Swift across multiple airplay formats and adds to her extensive record of chart-topping hits over the years.

The track drew 64.7 million airplay audience impressions in the week of 14–20 August to top the Aug. 29-dated chart, which tracks reach across more than 1,100 US radio stations. It is also her 16th No. 1 on Adult Pop Airplay, surpassing Maroon 5's record, and the first song by a woman to debut in Country Airplay's top 10, where it has since climbed to No. 7. Earlier this year the song became her 15th Hot 100 No. 1, and it is only the second soundtrack-based Radio Songs chart-topper of 2026, after HUNTR/X's "Golden" from KPop Demon Hunters.