Director Judd Apatow’s wife — and star of his latest film, “This is 40” — Leslie Mann left a bad taste in some customers’ mouths at David Chang’s sweets mecca Momofuku Milk Bar in Midtown. “Leslie had her driver drop her off and she ran in and ordered a soft serve ice cream with toppings for herself,” a spy tells Page Six. “What she didn’t realize is that she cut the line of six girls who were all waiting to order.” The spy added that one of the precocious girls in line waiting to buy a compost cookie quipped, “If this is 40, then I don’t want to be 40!” But Mann’s rep claims our source misinterpreted things, telling us, “The story is false. Leslie’s daughters [Maude and Iris] went in a few minutes prior to Leslie and were already waiting in line when she joined them.” Maude and Iris also star in their dad’s new comedy with Mann, Paul Rudd and Megan Fox. Beyond being a baked-goods connoisseur, Mann recently said of Fox’s goodies, “[She has] better boobs than I’ve ever seen in my life.”