Nathan Fillion Underwear (Boxers) and Shirtless Photos. What kind of underwear does Castle star Nathan Fillion wear? Boxers or briefs? Turns out he prefers a combination of the two. In an online conversation with Reditters he revealed that he prefers boxer briefs. Unfortunately, we don’t have a pic of our 42 year old Canadian hunk in his boxer briefs. But we do have these vacation pics of him wearing boxer shorts.
Hello, Mr. Fillion! How you doin?
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