Her new song is a reggae-tinged banger
Disco ball players have been installed around the world
Several A-listers have signed up to the Women's March on Washington to protest Republican leader's presidency
'As artists, women, and most importantly dedicated Americans, it is critical that we stand together'
Here we go again...
'I felt bad for him, and so I didn't really like to indulge in that'
Perry gave a heartfelt speech about the importance of voting before her performance
Celebrity fans are using Instagram as a new way of battling their idol's perceived feuds
The track will tie-in with NBC's coverage of the games, with Perry announcing its release on her own Twitter
Perry's tweets have only served to fuel the rumour the 'Firework' singer and Swift are in a long-running feud
Singers mock the ferocity of the Beyhive in recent days after the release of Beyonce's visual album and its allusions to infidelity
The easiest way to make millions as a celebrity is having your own gaming app – just ask Kim Kardashian. As Taylor Swift gets in on the act, Kate Wills reports on a nice little earner
From Stevie Wonder to Lana Del Rey
She quit their songwriting session after only an hour together.