Now that Rick Castle and Kate Beckett are officially a couple, the only thing better would be to see Castle actors Nathan Fillion and Stana Katic profess their undying love for each other in real life. Are we right?

Unfortunately, it looks like we'll have to settle for the pair's on-screen romance … for now.  

Nathan was spotted Tuesday, June 12, holding hands with a mystery blonde at the 52nd Annual Monte Carlo TV and Film Festival in Monaco. The photo agency credits her as his "fiancee" Kate Luyben, but we're not so sure that's accurate.

To the best of our knowledge, Nathan and Kate were an item in 2010, and called it quits in early 2011. In a September 2011 interview with David Letterman, Nathan mentioned a new girlfriend of one year, whom fans believe was L.A.-based stylist Emma Danoff.

Try as we might, Nathan's dating life is a mystery we just can't solve. Any theories about the lady in the photo? Tell us in the comments below!

UPDATE: Thanks to a Castle superfan, we have a name for Nathan's presumed new leading lady: Suzanne Freeman, a Los Angeles-based actress and host who was on Season 2 of The Bachelor. Check out her website here.


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