In Grey's Anatomy Season 8, Episode 18: “The Lion Sleeps," we finally get some Calzona action! In this sneak peek of the episode, Callie (Sara Ramirez) is freaking out because it turns out Arizona (Jessica Capshaw) once had a little thing with another doctor at the hospital a long time ago. She pesters Arizona to tell her exactly how many secret Seattle Grace-Mercy West exes she has. So, what's the number? Watch the sneak peek to find out Arizona's answer.