has been "transformed" by motherhood.
The 'Pirates of the Caribbean: On Stranger Tides' actress - who gave birth to son Leo, her first child with husband Javier Bardem, in January - explained becoming a mother has been a "revolutionary experience", which has changed her life forever.
She said: "From the first second, you feel so much love. It is a revolutionary experience. That's the best way I can describe it. It transforms you completely, in a second. Nature is very wise and gives you nine months to prepare, but in that moment, when you see that face, you are transformed forever."
The 37-year-old Spanish star admitted she found it "hard" to initially understand what becoming a mother would mean to her until she held baby Leo in her arms.
She added to US Vogue magazine: "Even if you have heard from all your friends and family, 'This is what's going to happen', until it happens to you, it's hard to understand in your soul."
However, Penelope and Javier are hoping their son will be able to lead as normal a life as possible as he grows up.
She said: "I want my son - and my kids
if I have more - to grow up in a way that is as anonymous as possible."