From: Favorite Hunks & Other Things
I first fell in lust with Nathan Fillion when he was on Buffy the Vampire Slayer. Since then he and his great bubble butt have been seen quite a bit on TV. Currently he is being terribly wasted on Desperate Housewives, but hopefully that will change in the future.
Nathan Fillion (/ˈfɪljən/; born March 27, 1971) is a Canadian actor best known for his role as Richard Castle on the ABC series Castle as well as his earlier portrayal of the lead role of Captain Malcolm Reynolds in the television series Firefly and its feature film continuation, Serenity.
He has acted in traditionally distributed films like Slither and Trucker, Internet-distributed films like Dr. Horrible's Sing-Along Blog, voice acted in video games Halo 3: ODST and Halo: Reach, television soap operas and sitcoms, and in theater.