What designer's grandson was a "tiny terror" at Super Saturday in the Hamptons last weekend? As Lorraine Bracco, Christy Turlington, Kelly Ripa and 1,500 others shopped at the Ovarian Cancer Research Fund benefit, "The kid was a category 5 tornado," one shocked shopper tells us, "knocking over clothing and displays." He then lifted a woman's dress, and, the source adds: "Neither his mother nor a nanny bothered to intercede. [The mom] didn't seem the slightest bit embarrassed." Finally, after several hours of misdeeds, the child was taken home.