While J.D. falls for a specialist, a bomb drops as news of an unexpected pregnancy hits the staff -- Elizabeth Banks (The 40- Year- Old- Virgin) guest stars in the second part of a two-part season finale - Smitten, J.D. (Zach Raff) tries to plan a perfect date with Dr. Kim Briggs (guest star Elizabeth Banks, The 40-Year-Old-Virgin) on their night off, but Elliot (Sarah Chalke) gets in the way. Meanwhile, Dr. Cox (John C. McGinley) and Jordan (Christa Miller) celebrate a milestone in their young son's life. Later, baby fever sweeps the hospital as the staff tries to pick a name for Turk (Donald Faison) and Carla's (Judy Reyes) expected baby, but no one could guess who at Sacred Heart has to sweat out a pregnancy next. Neil Flynn and Ken Jenkins also star.