Kathryn Dennis’ DUI arrest “surprised” her friends, with one pal telling RadarOnline.com that they are “concerned” for the ex-Southern Charm star after she was taken into custody for a three-car collision. As this outlet reported, the 32-year-old was booked for DUI and driving with an open container by the Goose Creek Police Department on Monday night after a responding officer noted Dennis displayed “glossy eyes and an odor of alcohol coming from her person.” The insider shared they were “not happy” to hear about her latest legal troubles, adding they worry about the reality star given her hi…