Makes me think of the movie Rush Hour - maybe? - with the little girl in the back of the car singing to Mariah Carey. This little one is way cuter, though.
When mine were 3, 3, and 5 they had a stint where "The way I mate" by the Rednex was their favorite song. Can you imagine 3 kids screaming "the way I mate, the way I mate, the way I, way i ,way I , mate.."! We thought it was funny, but we did get some weird looks in public.