Kelly sings "Dancing in the Street"; Judd Apatow, Leslie Mann, Iris Apatow, Maria Bakalova and Keegan-Michael Key ("The Bubble"); "The Bubble"-theme game; brothers reunited in Sacramento; students react to teacher's engagement; Sophia Scott performs.

Kelly sings "Show Me the Meaning of Being Lonely"; Backstreet Boys Nick Carter, Howie Dorough, AJ McLean, Brian Littrell and Kevin Richardson; Throw Me a Line game; Taylor Tomlinson; brothers co-author a book; First Day of School Band; Desz performs.