Anyone with a soft spot for 'Who's the Boss' cutie Alyssa Milano will be excited by a little casting news: Milano plays a "one that got away" ex on a episode of 'Castle.'We got a chance to chat with Milano about her upcoming guest spot, how far her relationship with Nathan Fillion's title character goes and if she's going to reappear on the show. We couldn't resist asking about her hilarious 'Jersey Shore' video for Funny or Die. Milano tells us how the whole thing came about... and she also admitted that she still hasn't seen an episode.