Cristiano Ronaldo and girlfriend Georgina Rodríguez are mourning the loss of their newborn son.

On Monday, the soccer star, 37, shared a heartbreaking post on social media announcing that one of their newborn twins, a baby boy, had died.

"It is with our deepest sadness we have to announce that our baby boy has passed away. It is the greatest pain that any parents can feel," Ronaldo wrote. "Only the birth of our baby girl gives us the strength to live this moment with some hope and happiness."

Ronaldo continued by thanking their doctors and nurses for "all their expert care and support."