Wonder twin Mary-Kate Olsen — who's still bruising from that New York Minute wreck — was involved in a fender-bender on a Los Angeles freeway Thursday. According to Extra, Ashley's other half was rear-ended by a black Yukon driven by (yikes!) her bodyguard! Mary-Kate was not injured in the crash, but eyewitnesses say the soon-to-be-18-year-old was a little startled. A photo in today's New York Post — which shows her slightly bewildered and clutching a can of Diet Dr. Pepper — seems to back that up.