I also offer congratulations.

In matters like these, I turn to my mother, a research editor at National Geographic Magazine (sorry, I know I've dropped that before):

Quote:
I think the general rule is that there's no firm rule! This is from The Economist's style guide:*

Quote:
There is no firm rule about the number of a verb governed by a singular collective noun. It is best to go by the sense—that is, whether the collective noun stands for a single entity (The council was elected in March, The me generation has run its course, The staff is loyal) or for its constituents: (The council are at sixes and sevens, The preceding generation are all dead, The staff are at each other's throats). Do not, in any event, slavishly give all singular collective nouns singular verbs: The couple have a baby boy is preferable to The couple has a baby boy. Indeed, in general, treat both a pair and a couple as plural.

That said, I think "Look who's finally getting married" sounds better to the ear.

*The Economist is British, but this still makes sense to me.
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Matt