the singer with the long tattoo *possible spoiler*

i've seen this quite some time ago, so i'm not exactly sure. but there was this scene where this beautiful woman on stage singing.. she has a long tattoo going from her back to arm.. i think a snake. is there a way i can find that clip or song any where?

ps. Lake Bell is absolutely stunning in this movie.

I'm an alcoholic, not a barbie doll.