The 26-year-old bisexual actress said she loves watching old films because of the traditional views on courtship and can become "transfixed" while viewing them.
"I like Lauren Bacall and Rita Hayworth in 40s films, which my mother used to watch at home. I can sit in front of the TV and watch an old romantic film and be transfixed. I am just like any other girl, a sucker for romance," she said.
Heard, who first met Depp on the set of "The Rum Diary" while he was still with partner Vanessa Paradis, thinks her mother knew from an early age she was different from other children.
"I think my mother realised she had a somewhat unusual daughter pretty early on. I went to a Catholic school but did not really fit in. I also had an obsession with cars. Yet at the same time I was feminine and girly. You wouldn't find me at the school prom, that's for sure.
My mom allowed me time and space to become my own person, which is key when you are growing up," she added. The actress is said to be the reason behind Depp parting ways from Paradis, his partner for 14 years.