Though she did not grow up with parents in the entertainment business — her father was a businessman in commodities, while her mother worked as a teacher — Julia Louis-Dreyfus wanted to be a performer from “the earliest age” — as in very early. “I would even perform during nap time in nursery school, so I remember very vividly standing on top of my blanket and dancing and hoping people were going to be watching — and they were, by the way,” she recalled. Louis-Dreyfus has had eyes on her ever since, and countless more are focused on the legendary actress this week as she’s just touched down in Cannes for the world premiere of her festival selection, Tangles , an animated film that she stars in and produced alongside Seth Rogen and wife Lauren Miller Rogen.…