The “Delusional” singer took to X on Thursday (Jan. 2) to crow about the fact that her debut single, “Tik Tok,” is back on top again. “It was 15 years ago that I got my first #1 song!

Tik Tok In this popular lip-synching video app, users create videos lip-synching to music and follow or are followed on a platform that looks much like Instagram. (Musically was recently re ...