Dina Tribbiani (Marla Sokoloff): Joey's youngest sister, who appeared in the episode "The One With Monica's Boots." She is considered the smartest and most well behaved of the Tribbiani children. She took the SATs and went to college for "both years", but still isn't terribly bright. At one point, she asks Rachel, "Do you ever worry that you'll be walking and your baby will just slip out?" When Dina discovered she was pregnant, she went to Rachel first because Rachel herself is unmarried and pregnant at the time and is asking her to help her tell Joey. Dina says that Joey is her favorite guy in the world and that she was more scared to tell him that she was pregnant than anyone else. She got pregnant by her boyfriend, Bobby Corso.