The 32-year-old uploaded a photograph of his girlfriend Georgina Rodriquez, 22, holding their baby daughter next to him and his eldest son, Cristiano Jr.
He wrote on his Instagram page: ‘Alana Martina is just born! Both Geo and Alana are doing great! We are all very happy!’
The family arrived at the Hospital Quiron Universal in Madrid, near the footballer’s home on the nearby gated VIP estate La Finca, earlier on Sunday afternoon.