Pakistan, Sept. 9 -- Taylor Swift has sparked fresh TS13 speculation while celebrating her return to the top of the country radio charts. Her Toy Story 5 song, I Knew It, I Knew You, has earned her first Country Radio number one in 13 years. Swift celebrated the achievement with a handwritten note thanking Country Radio for welcoming her back. However, fans quickly focused on the number 13 and began searching for a hidden clue.

Swift's handwritten message highlighted that the milestone came after a 13-year wait. The number holds special meaning for the singer and has long been associated with her fandom. Fans also know that Swift's next album is expected to become her 13th studio album. As a result, many Swifties believe the number could...