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Justin Hartley (serietele.com)

Justin Hartley is going from “Smallville” to “Castle.”

The actor who play the role of Oliver Queen on the Superman-inspired series is following the footsteps of Hilarie Burton as guest-stars on “Castle.”

Hartley will play the boyfriend of Burton’s character named Kay Cappuccio, a Kim Kardashian-like reality star who’s famous for being famous.

Their episode, which will be titled “An Embarrassment of Bitches,” will air early next year.

34-year-old Hartley is best known for his roles on “Passions” and “Smallville.” He had appeared as guest star on other series too, such as “CSI: NY” and most recently, “Chuck.”