There are some things they just don’t teach you about growing up.

When hackers stole private pics of Emma Watson and nude shots of Amanda Seyfried for broadcast on the Internet, some people weren’t exactly sympathetic. After all, only millennials would be stupid enough to post intimate images on the cloud, right?

But Kelly Williams Brown — who literally wrote the book about how to be an adult — says people need to shut up with the rhetoric about millennials ending civilization. After all, kids these days have to deal with situations previous generations didn’t. “Because it’s the internet, we excuse the leak of personal photos,” she tells Moneyish. “But if someone snuck into your house and took personal photos of you, they’d be arrested as a sex offender.”

Her advice to others who may have documented intimate moments that were compromised? Own it. “You did nothing wrong but instead were stolen from,” she says. “When we look at these images, we’re complicit in a sex crime.”

‘Adulting’ expert Kelly Williams Brown (William Bragg)

Brown is the author of “Adulting,” a best-selling guide to growing up (Sample tip: “Anything that tastes really good — think twice about.”) She was in New York on Thursday to mark the 18th birthday of Swiffer, but her mission goes beyond teaching hapless young ‘uns about the essentiality of the household cleaning brand to a spick-and-span apartment. She also hopes to convince others that millennials are people too.

“Most of the stereotypes aren’t about millennials but about young people,” she says, rolling her eyes when asked if 20-somethings are as entitled and lazy as Time magazine famously suggested. “It’s normal to have grandiose ideas and not know how to behave in the office when you’re young.”

One millennial the 32-year-old former newspaper reporter thinks is adulting successfully is Watson, the formerly child star who’s now a proud feminist and UN Women Goodwill ambassador. “I think she’s wonderful, I’ll never have anything bad to say about her,” says Brown, who otherwise cautions against putting too much weight on the “Instagram version” of things.

Up next for her: the April release of “Gracious,” a Emily Post-esque manual on behaving well in the 21st century. “We could certainly use more of it now,” she says.