'The Cure' singer later Tweeted that she was sending pizza for any fans waiting outside her Montreal hotel.
"I'm sending free [pizza] to any Monsters outside my hotel, The William Gray Montréal. I love you so much and I'm so sorry you are the most loyal fans," she wrote.
Last week Gaga's ex-fiancé Taylor Kinney showed his support for the star whilst in the audience at her Chicago concert.
This article originally appeared on Who.