Princess Bubblegum in Veggie Village in the episode "Death in Bloom"
Veggie Village is the village that Stanley The Watermelon and his family lives in. It first appeared in "The Jiggler," when Finn and Jake took Stanley's family into the only house in Veggie Village, after they got into some trouble. In the episode "Death in Bloom," Princess Bubblegum came to Veggie Village for a "science thing."