Lorde said having a friend who's as famous as Swift is like contending with autoimmune disease.
Swift and Perry have been locked in a quiet feud for years.
Swift decided that as Perry shared her new album on YouTube via a special event ('Katy Perry: Witness World Wide'), she'd release her entire back catalog on all streaming services.
'I mean, I'm not Buddha,' Perry said.
From subtweets to side-eye to diss tracks, 'beef' is a pop music tradition of the highest order.
In the first round of this year's Summer Fan Showdown, it's Taylor Swift against Girls' Generation in a battle for the 2017 fan crown.
She also opens up about family dramas and shortening her time on social media.
Appearing on 'The Late Late Show With James Corden,' Katy Perry spoke out about her and Taylor Swift's 'Bad Blood.'
From Lorde's 'Melodrama' to Kelly Clarkson's long-awaited return after a label switch-up, these are the albums we can't wait to hear coming later this year.
'To go from rebranding as political activist only to ditch it and go low is a bummer,' Rose tweeted.