She said: "He's extremely charming and charismatic. It's very easy to imagine him as Superman because of his look and his presence.
"Whenever I looked into his eyes, I started giggling because he has this effect on you. I think most women feel the same way about Henry. He's dreamy!"
However, away from the film set, the 38-year-old star only has eyes for fiance Darren Le Gallo - with whom she has two-year-old daughter Aviana - who she credits for making her feel "complete".
She gushed: "He's enabled me to grow up and evolve into a much more mature and complete woman. I think he also helped me become a better actress. When you find that kind of man, it eases a lot of anxieties and you just enjoy the process of loving someone with all your heart."
Before becoming a Hollywood star, Amy admits she lacked self-confidence as a child and was "painfully awkward.
She added: "I was very homely and didn't fit in at school. I always thought of myself as painfully awkward. I wasn't brimming with the self-confidence you need to go on and become an actress."