'You're OUR Piano Man': Billy Joel's ex-wife Christie Brinkley sends love following his diagnosis

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

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

Christie Brinkley, singer Billy Joel’s ex-wife with whom he shares a daughter, spoke out about his recent diagnosis of a brain disorder in a heartfelt Instagram post Saturday.

The 71-year-old career model posted videos of Joel and their daughter, Alexa, at a recent concert, with her singing in the audience to some of her dad’s iconic hits.

“I was looking for some cute photos of you and Alexa to send you, when I came across this clip from a recent concert,” Brinkley wrote in the caption. “It made me laugh ..but it also reminded me of all the joy you create, and all the sensational sing a longs you’ve lead.”

Joel, 76, announced Friday that his upcoming concerts would be canceled due to the diagnosis of normal pressure hydrocephalus, or NPH. The disorder can cause trouble walking and thinking clearly, but is sometimes reversible and can be treated.