The Battleship actress says that she struggles to show off her "feminine" side as she prefers more boyish fashion choices.
"The biggest thing is finding that balance between masculine and feminine," the 25-year-old explained in an interview with FabSugar.
"Because I'm such a tomboy, I hate showing off my body. [My stylist] is always like, 'You have to show your figure'."
Decker recently revealed that she considers Gisele Bundchen to be her number one girl crush and finds her to be "perfect" in every way.
Earlier this month, Decker said that she would like to adopt a child with a learning disability with husband Andy Roddick.