Ambitious, gregarious orthopedic surgeon Callie Torres has certainly made the rounds, romantically speaking — but don't tell her super-religious father! After George O'Malley and Meredith Grey's ill-fated fling, George started dating Callie. They got married... and then divorced. It was a whirlwind. Callie then hooked up with Mark Sloan and Alex Karev, but the arrival of cardiothoracic surgeon Erica Hahn prompted Callie to question her sexuality. In the wake of her sudden break-up with Erica (over an argument about the existence of bisexuality, natch), Callie sought comfort in the arms of pediatric surgeon Arizona Robbins. After fighting for months, the women have finally come to see eye-to-eye about having children together, which turned out to be very important: The couple broke up when Arizona went to Africa to do research, and Callie sought comfort in Mark's arms. Now she's pregnant with his child. Fortunately, she and Arizona are reconciled, and the family Callie has always wanted may be in the works!