Billy Joel’s ex-wife is still cheering on everyone’s favorite Piano Man. The day after the singer announced he was canceling all of his future tour dates following a brain disorder diagnosis, supermodel Christie Brinkley told her ex to take care of himself,

Following news of Billy Joel’s battle with a brain disorder, the Piano Man’s daughter Alexa Ray Joel turned to social media to thank his fans for their support as well as share a hopeful prognosis for her father.

The singer canceled his upcoming concerts because of the brain disorder. Here’s what to know about the symptoms, prognosis and treatment.