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Gummersall was a guest on 'Castle' this past Monday. The episode was called 'The Mistress Always Spanks Twice', you can watch it on iTunes or Hulu.
http://www.hulu.com/castle

Here's a screenshot from that episode. And yes, that's "Lane Kim" (Keiko Agena of "Gilmore Girls" fame) next to him. Keiko is almost exactly five years older than Devon, btw.