What will Kate Beckett say to Rick Castle's proposal on the Castle Season 6 premiere? We don't know.

But what will fans of this ABC smash have to say about the following promotional photos, released by the network this week in anticipation of the September 23 premiere? We can take some pretty strong guesses.

And they'll all be glowing, considering the poses struck below by stars Nathan Fillion and Stana Katic.

Can you envision these two exchanging vows at some point over the next few months? Fillion appears to be dressed for the occasion... but what should we read into the fact that Katic is dressed in gold, not white?!? Okay, probably nothing. Just click on each pretty picture now for a larger version and answer the poll question below...

What should Beckett say to Castle's proposal?

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.