By Stephanie Lysaght and Denise Martin, Los Angeles Times staff writers She can't rule the world forever, and "iCarly" star Miranda Cosgrove is already nipping at her heels. Sooner or later, tween queen Miley Cyrus will graduate to more adult fare. When she does, a new fresh-faced adolescent will inevitably take her place. But who will it be? Demi Lovato? If anybody is poised to inherit Ms. Cyrus' crown, it may well be Disney starlet Demi Lovato. Her album, "Don't Forget," entered the charts at No. 2 last year, and she was lucky enough to woo one of the Jonas Brothers in TV movie "Camp Rock." You can catch her playing sketch comedy star Sonny in the new Disney Channel series "Sonny With a Chance."
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