So SWMBO and I are tying the knot at the end of the year and we're currently looking at wedding invitations. We've settled on a design, but are currently having difficulties agreeing on the grammar of sentence on the front of the card.

Currently it reads:

'Look who's finally getting married'

SWMBO thinks it should be:

'Look who are finally getting married'

I think the original sentence is okay, SWMBO's version is probably correct too but just doesn't scan correctly. What do you guys think?