Ke$sha

From Ariana Grande to Gigi Hadid, read all about these celebrities' encounters with ghosts!

See what Katy had to say.

A few couldn't be bothered to memorize the script, but at least their heart was in it!

A judge ruled the singer defamed her producer in a text message to Lady Gaga.

Ashlee Simpson is just one of many stars who bungled sets on TV's most coveted stage.

Watch Kesha perform her star-making party anthem.

Lady Gaga defended Kesha against Dr. Luke's lawyer in an unsealed deposition.

The pop stars' text convos were revealed in newly released court docs from Dr. Luke's defamation case against Kesha.

The singer gets deep (and silly) with Mark Ronson, Diane Warren and more for a roundtable of Oscar-buzzing songwriters.

The song was penned for the upcoming film, 'On The Basis of Sex.'