Christie Brinkley is showing support for her ex-husband Billy Joel following news of his recent brain diagnosis. The supermodel, who shares daughter Alexa Ray with the legendary singer, posted a video on Instagram Saturday -- just one day after Joel revealed he had been diagnosed with normal pressure hydrocephalus.

The supermodel, who was married to Joel for 9 years, shared the message a day after the "Piano Man" singer revealed he was diagnosed with a rare brain disorder.

American singer, song-writer and piano man, Billy Joel has canceled all his upcoming concerts across England and North America after being diagnosed with a rare brain disorder.