Celebrity Central / Top 25 Celebs
Credit: Sara De Boer/Startraks
Published: Friday July 12, 2013 06:00 AM EDT
More from PEOPLE
See More News
15 of 238
Demi Lovato is ready to go on Thursday, standing up to X Factor co-judge Simon Cowell at the show's Los Angeles auditions.
Copyright © 2013 Time Inc. All rights reserved. Reproduction in whole or in part without permission is prohibited.
In partnership with AOL