song in advert where she says fall in a long way like fa-ha-ha-ha all?

[Mr.Melody 7]

ok if you've seen the advert i'm not sure but i think it's perfume so the song is a woman singing and she says fa-ha-ha-haall (fall) but like that i just wanna know the name of the song or/and who sang it.

thx 4 reading