Who Is The Singer?

Beautiful song - the artist appeared on the Bachelorette show, and it went something like: (female singer, might be Natasha Bedingfield but I don't know): ( Anyway- "Somebody tell me why I'm all alone"

Who is this and what is the name of the song?

maybe the verse was "somebody tell me why I'm on my own"?
Then it is Natasha Bedingfield (as you was guessing yourself already), and the song is: Soulmate
Here is song for you to listen: http://www.youtube.com/watch?v=ZbITxYgtlAY