They may have long since split, but the 'Uptown Girl' reached out to everyone's favorite 'Piano Man' to let him known he was in her thoughts.

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.