Spoilers: Will Castle Become a Ladies' Man in Season 4?

Castle (Nathan Fillion) might be head over heels in love with Beckett (Stana Katic), but that won’t stop him from testing the waters with other potential lady friends!First in line for Castle’s heart is guest star Kristin Lehman. Fillion tells TVLine "sparks will be flying" when The Killing hottie steps on set to play a "gorgeous, sexy, sophisticated art insurance investigator." And don’t think Beckett won’t know what’s up!"There is...


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