Milano is already on set and Tweeting about the gig, in which she plays the former love interest of the handsome leading man.
“I’m off to a wardrobe fitting 4 Castle. Hold down the fort while I’m gone,” Milano writes. “Don’t let the RT feature talk behind my back.”
According to EW: “Castle reconnects with Kyra (Milano) on her wedding day and sparks fly. Beckett (Stana Katic) picks up on the obvious connection between the two of them, setting up a fun little love triangle.”
Check Out the Alyssa Milano Photo Gallery Here
The episode is expected to air in early 2010.