Credit: Jason Merritt/Staff Photo: Nathan Fillion Arrives at the Super Premiere on March 21, 2011

If you're dying to know who Nathan Fillion will be wrapping his big, strong arms around this Christmas (aside from his two adorable cats, of course), you're not alone.

Unfortunately, this is one Castle mystery we haven't been able to crack.

Nathan's last rumored relationship was with Super co-star Mikaela Hoover, but the pair haven't been spotted out and about together since the premiere back in March. Prior to Mikaela, Nathan was courting a blonde-haired actress named Kate Luyben, but we haven't seen them together since the 2010 American Music Awards.

So, does this mean Castle's leading man is riding solo this holiday season?

Nathan always seems to be canoodling some gorgeous Hollywood lady or another, and he did mention a girlfriend during his September interview with David Letterman (fans speculate he was referring to L.A.-based stylist Emma Danoff), but we're going to pretend he's single for the time being … which, of course, means we still have a chance.


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