They're about to teach each other how to act their age.

Molly Gunn, the freewheeling daughter of a deceased rock legend, is forced to get a job when her manager steals her money. As nanny to Ray - the precocious, oft-ignored daughter of a music executive - she learns what it means to be an adult while teaching Ray how to be a child.
Uptown Girls keeps every mind human — it fights its subject at zero distance. The story fights on E8 of the E0–E14 reality ladder.
Films fighting at the same level of reality, about the same things.
The same preoccupations examined at another scale — one mind versus a nation.