Christie Brinkley is sending lots of well-wishes and prayers to ex-husband Billy Joel as he navigates a battle with normal pressure hydrocephalus (NPH).

"Dear Billy, the whole Brinkley gang is sending you lots of love and good wishes for a full and speedy recovery," Brinkley, 71, wrote via Instagram on Saturday, May 24, sharing a video of Joel, 76, singing with their daughter, 39. "I was looking for some cute photos of you and Alexa to send you, when I came across this clip from a recent concert. It made me laugh, but it also reminded me of all the joy you create, and all the sensational sing-a-longs you've led."

She added, "You turn an arena of strangers into a living room full of friends as we all sway in unison. I'm sure I'm speaking for everyone in that room when I say, pleas

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