The Piano Man and his Uptown Girl. Billy Joel’s ex-wife Christie Brinkley showed her support for the singer, 76, after he announced he’s been diagnosed with a type of brain disorder called normal pressure hydrocephalus.

Singer Billy Joel revealed his diagnosis with a brain disorder called normal pressure hydrocephalus and canceled 17 upcoming concerts while he recovers.

"My Dad is the strongest and most resilient man I've ever known... and he's entirely committed to making a full recovery with ongoing physical-therapy treatments as he continues to regain his strengt...