Katy Perry broke the news that there has been a sudden change in her UK and Ireland tour support via her Twitter page this evening (March 28).

Perry tweeted: "FYI ALL UK & IRELAND RELATED SHOWS @CalvinHarris will NOT be joining in on the fun and has CANCELLED last minute."

No other reason has been given at this stage. Please check Pressparty for any further updates.

Watch Katy Perry be interviewed for YouTube below: