Teen superstar Mary-Kate Olsen has been addicted to coffee since she was just 10-years-old.

The New York Minute actress, 19, is famous for guzzling caffeine rich drinks and is rarely seen without a Starbucks in her hands.

She says, "When I was younger, on weekends, my mom would make us pancakes with our initials on them and then a tiny cup of coffee.

"I remember, at 10, sneaking my own coffee and pouring a ton of sugar in and going up to the playroom and drinking it."

The actress reveals the best gift she has ever been given is her new espresso machine.

She adds, "It's the most amazing thing I've ever had. It makes cappuccino all day long."