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Kristen Stewart, Car Accident

AKM-GSI

Kristen Stewart had the wrong kind of bang-up day.

The Twilight heroine was in a minor fender-bender today in Los Angeles while out visiting a friend, a source exclusively tells E! News.

We hear that Stewart responsibly exchanged info with the other driver and all parties appeared to be OK.

Our eyewitness also says that Stewart waited while the woman, who had a few kids in the car with her, checked out a bit of damage to her rear-left bumper and popped a loose piece back into place.

"Kristen appeared to be a bit shy and embarrassed" at the scene, the source says. "Luckily no one was hurt in the accident."

Stewart's rep has not yet returned a request for comment.