Bet Meredith (Ellen Pompeo) wishes everyone else had forgotten about her dinner party too.

Thursday's episode of Grey's Anatomy picks up right where last week's left off - with the shocking reveal that Callie's (Sara Ramirez) new girlfriend, Penny, is none other than the redheaded doctor who was unable to save Derek's life last season (and later admitted to Meredith that a more skilled doctor probably could have).

If Callie thinks that introducing Penny (Samantha Sloyan) to Arizona (Jessica Capshaw) is going to be awkward, just wait until Penny and Meredith have their first face-to-face encounter since that terrible conversation in the parking lot of the hospital. (Assuming Meredith doesn't decide to just hide in the bathroom all night.)

Check out a sneak peek from the episode above.

Grey's Anatomy airs Thursdays at 8/7c on ABC.