Big Mommas: Like Father, Like Son (2011)

After stepson Trent (Brandon T. Jackson) witnesses a murder, FBI agent Malcolm Turner (Martin Lawrence) brings back Big Momma, his plus-size alter ego, to help solve the crime. Big Momma goes deep under cover at a girls school of the performing arts, but this time he has Trent and Trent's female alter ego Charmaine as backup. The duo must try to find the killer before the killer finds them, but complicating matters is Trent's crush on a student (Jessica Lucas).