Taylor Swift's 'Patient Zero' is her newest No. 1 hit. Here are all 16 of her songs that topped the chart.

Taylor Swift onstage at the Eras Tour. Shirlaine Forrest/TAS24/Getty Images for TAS Rights Management Taylor Swift's newest single, "Patient Zero," debuted at No. 1 on the Billboard Hot 100. Swift has the fourth-most No. 1 hits in history, trailing Elvis, Mariah Carey, and The Beatles.