The movie is obviously targeted at children. There may be a few jokes in there for the benefit of the adults who'd be taking the kids to see it, but that does not change the fact that it's primarily targeted at young children.
Now why would we need a sexually evocative picture of the Smurfette looking over her bare shoulder with this "come hither" look in her eyes? The six-year-olds are hopefully not even on Facebook, so I know that this ad is not meant for them (never mind the post title). The adults should be mostly interested in going to see this film because of their children, and hopefully not for some smurf soft-porn. It's utterly confusing to me.
Now, to be fair, this is not quite reaching the creepiness level of push-up bikinis for young girls, or child beauty pageants, but still, can we maybe keep the objectification of women at least out of the children's movies? No? Thought so.