The 'Leave Me Alone (I'm Lonely)' hitmaker was due to sing some songs at the LG Arena but was told she mustn't as she has an inner ear and breathing infection.
She said the following things on Twitter by way of an apology: "With deepest regrets I had to cancel my first show of the tour tonight in Birmingham."
"I have an ear and respiratory infection. I am not a person that takes cancelations lightly and I apologize to anyone who was inconvenienced by my illness."
The English spelling of 'apologize' is, of course, 'apologise'.
She's due to perform four dates at London's O2 arena starting tomorrow. No word yet as to whether these will go ahead.