Lady Gaga teased her new album with a cryptic 'Tik Tok' teaser, prompting 'TikTok' singer Kesha to respond on social media.

New documents from an investigation by Kentucky’s AG claim TikTok is well aware of kids under 13 using the app — and of underage girls stripping on livestreams.

Kesha announces plans to re-record "Tik Tok" with new lyrics, highlighting her 15-year journey since its release.

The duo then broke out into Kesha’s 2009 hit “Tik Tok,” but instead of singing the song’s original lyrics: “Wake up in the morning feeling like P. Diddy,” the singer altered it ...

Kesha performed 'Tik Tok' and 'Joyride' during her appearance on 'New Year's Rockin' Eve' Tuesday night.