Kristen tells the July issue of ‘Vanity Fair’ that she learned her lesson the hard way about letting her guard down — read on for the funny yet traumatic experience!

Kristen Stewart just revealed again why she’s such a private person! The 22-year-old actress tells Vanity Fair that one Twilight made her a household name, she had to change her carefree ways. First order of business: don’t walk around in underwear!

“You can Google my name and one of the first things that comes up is images of me sitting on my front porch smoking a pipe with my ex boyfriend and my dog,” she says. “It was taken the day the movie came out. I was no one. I was a kid. I had just turned 18.”

So what did she learn from that experience?

“The next day it was like I was a delinquent slimy idiot, whereas I’m kind of a weirdo, creative Valley Girl who smokes pot,” she says. “Big deal. But that changed my daily life instantly. I didn’t go out in my underwear anymore.”

But lucky for Twi-hards, they get to see her half-naked in the upcoming Breaking Dawn movie — and fully nude in On The Road.

— Victoria Johnson

More on Kristen Stewart’s Weed Smoking:

1. Kristen Stewart Smoking Pot On Camera — Pic Of K.Stew Rolling A Fattie
2. Rihanna Kristen Stewart, & 18 More Celebs Who Smoke Weed
3. Kristen Stewart Smoking Weed — Is She A Rebel Role Model for Miley Cyrus?