Hamilton music fans won't be going gaga over Lady Gaga.
The pop superstar has postponed her concert at Copps Coliseum this Sunday.
The 26-year-old has a case of synovitis, which is a severe inflammation of joints, and has been told by a doctor to stop performing.
A make up date has not been announced.
She has also called off shows in Chicago tonight and Thursday and in Detroit on Saturday.
In a statement, Gaga says, "I am completely devastated and heartsick. I’ve been hiding this injury and pain from my staff for a month, praying it would heal, but after last night’s performance, I could not walk."
Lady Gaga's "Born This Way Ball" world tour is scheduled to wrap up on March 20.