On tonight's special two-hour Private Practice, Addison (Kate Walsh) performs a complex in utero surgery, proving not only her talents to her father but also finally giving them some common ground. Meanwhile Sam (Taye Diggs) and Naomi (Audra McDonald) deal with their own family crisis when they discover their daughter is growing up way too fast, and Violet (Amy Brenneman) does the unthinkable. What this unthinkable is, we already know from all the promos.

Poor Addie, right?