Billy Joel has been flooded with love and support since revealing he was diagnosed with a brain condition called normal pressure hydrocephalus. Among those supporters was his ex-wife Christie Brinkley, with whom he shares daughter Alexa Ray Joel, 39, and with whom he still has a close relationship 30 years after their divorce.

Christie Brinkley never could have guessed that her mom was struggling with atrial fibrillation, a heart arrhythmia that can increase the risk of stroke, heart failure, and other health complications.

Dua Lipa,Christie Brinkley, and Kendall Jenner all wore red bikinis. Shop red swimsuits, including underwire two-pieces and sculpting one-pieces, from $25.