The We Bought a Zoo actress, who didn't wear any make-up for the film, revealed that she enjoys feeling put together in real life.
"I always like to put a little bit of make-up on," Johansson told Style. "I'm not the kind of person that just slops around in sweatpants.
"I like to feel a little more together - you never know who you're going to see out there!"
Johansson went on to say that she never goes anywhere without red lipstick.
"My absolute must-have is a really rich and vibrant red lipstick," she said. "I always keep red lipstick in my bag because I never know when I might show up to an event and be completely underdressed. I feel like red lipstick is the cure-all for everything."
The actress is reportedly dating Tribes guitarist Dan 'Skywizard' White. She split from husband Ryan Reynolds in November 2010.
Earlier this month, she revealed that she hates being called 'ScarJo' by the press.
Watch the trailer for We Bought a Zoo below: