Actually, no; it's a reprint. Too bad it isn't the one aprilp_katje exprected, though; otherwise I wouldn't feel like I was on a roller coaster.
Panel 1: We start off with Elly carrying a package of some sort; she tells John, who's reading the paper, that his little wifey just got into a size 10, so there!
Panel 2: John, who was half-way joking about her putting on weight, says that's great and wants to see it for himself.
Panel 3: He looks at the tag and says "Hey! This is a size twelve"; this discovery causes Elly's eyes to bug out,
Panel 4: Her explanation that she just said she got into a size ten but didn't say she could wear clothes that size does the same thing to John.
Summary: I would have rather seen her decide that she'd be better off buying groceries after all; at least then we wouldn't have to had dealt with this much whiplash. The strangest thing is that Lynn seems to not know how elastic clothing sizes are; most of us have had experience with how that works so Elly's not knowing this seems sort of unrealistic.