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 daughter of music legend Billy Joel shared a touching tribute after the “Piano Man” singer was diagnosed with normal pressure hydrocephalus and canceled all of his upcoming concerts.

Uptown Girl singer Billy Joel cancelled all his upcoming gigs after revealing he had been diagnosed with a rare brain disorder earlier this week

Billy Joel's daughter Alexa Ray says her father "continues to regain his strength" while battling a brain disorder.