The "Other" Castle Couples

Yes, we're as madly in love with Caskett as you are. But this Valentine's Day, we're thinking about all the other couples who've made Castle sizzle over the years. Who's your favorite?

RICK AND GINA

Castle briefly took the "ex" out of his relationship with his publisher and second wife Gina when the two spent the summer together in The Hamptons. In the end, there wasn't enough to magic to make the couple last.