Female audition song?

I'm auditioning for the dance ensemble in a production of CATS, and unfortunately all performers have to have a singing audition regardless of whether or not you will have a singing role. We are required to prepare one Broadway style song in the style of CATS, but not from this musical (music written by Andrew Lloyd Webber is recommended). The thing is, I can't sing worth a rat's ***. I don't exactly know my range or anything, I'm a 14 year old girl with a semi-high slightly scratchy voice. Can you help me at all? What would be the easiest/best song to sing? Of course I'll practice a bunch and hope to get better by auditions.