That seems to be the editorial mantra at Yahoo! Style: Any word that ends in an S, even a name, must include an apostrophe before the S:
There is no other way to explain something like that. Unless it’s an acute case of carelessness, ignorance, and/or idiocy. While I’m at it, maybe someone will explain to me what “Love, Rosie” is doing in the middle of that sentence. Is it the title of a movie? If so, it needs quotation marks or italics — something to make it distinct from the rest of the text. It’s not a showstopping error, but spelling showstopping as two words is.