Jennifer Garner June's Mom (voice) Matthew Broderick June's Dad (voice) John Oliver Steve (voice) Mila Kunis Greta (voice) Kenan Thompson Gus (voice) Ken Jeong Cooper (voice) Norbert Leo Butz Peanut (voice) Brianna Denski June (voice) Ken Hudson Campbell Boomer (voice) Sofia Mali Young June (voice) Kevin Chamberlin Uncle Tony (voice) Kate McGregor-Stewart Aunt Albertine (voice) Kath Soucie Bus Counselor Shannon (voice) Meilee Condron Additional Voices, ADR, looping (voice)