If you like your ice cream both naughty and nice, you're going to like this piece of news: Clementine's Naughty and Nice Creamery(1637 S. 18th St., 314-858-6100) is expanding, with a shop now planned for 730 De Mun Avenue.Owner Tamara Keefe hopes to open the new location in June, leapfrogging a previously announced second location in the Southampton neighborhood. Located in a former hair salon in the same block as De Mun Oyster Bar, the De Mun shop will be twice as large at the original in Lafayette Square, Keefe says.…