Happened to hear her on my local jazz station the other night....quite a nice voice, and only 22-23 years old. Thought I'd spread the word. She has a Wiki page as well. Here's a quote from the wondrous Nancy Wilson:

"I think she´s brilliant, I love her.… There´s so much that´s good: the body, the depth, the warmth, and the enunciation!” - Nancy Wilson


http://www.rachaelprice.net/

if you liked her then i would recommend you to listen to this new singer Luba Mason. she is coming up with a new album 'Krazy Love'. the album is getting released this month only. she is wife of Ruben Blades. you can listen to a few songs on her Myspace. i am eagerly waiting for the album.
http://www.myspace.com/lubamason

Madeline Peyroux. Another beautiful voice I'm recently loving.

I am in love with female jazz vocalists! i read about one more in 'All About Jazz' & she is Margo Reymundo. she is absolutely beautiful and has the voice of an angel. i would recommend her to everybody who likes Latin influenced Jazz and vocal Jazz. she’s gorgeous!
http://www.flickr.com/photos/margoreymundo/

i've got another great new jazzy soulful singer for you. Sally Kellerman's voice is sensual and soothing. her new album Sally is good for relaxing or dancing, perhaps with a special someone ha i found her just roaming around itunes. definately check her out @ sallykellerman.com

-jaycook