Half Blood Prince

Yeah, it'd be kind of weird if the first we hear of Fleur and Bill's relationship is when Harry, Ron, and Hermione are actually at their wedding at the beginning of Deathly Hallows Part I. It's bad enough they never mentioned the two were dating in Order of the Phoenix (or if they did, I missed it...I'll be watching the movie again soon, so I'll pay close attention for even the breeziest of passing mentions by any of the Weasleys). Then again, the two should have met in Goblet of Fire.

Where are they even going to have the wedding now that the burrow is burned down? David Yates buggered up HBP but good.

Others, however, will call me the world's sexiest killing machine, who's fun at parties.

No reason to introduce Bill if they aren't going to have the wedding. I'm pretty sure they are because of the clothes the main 3 are wearing in some of the stills looks rather formal.