(The Associated Press) No need to grieve, tweens: Miley Cyrus is not dead.The "Hannah Montana" star, who is alive and well, was the victim of an Internet hoax over the weekend when someone hacked into her YouTube account and posted a video alleging she'd been killed by a drunken driver.The video, which has been taken down, had a fake message from Cyrus pal Mandy Jiroux, who swiftly denied the rumor in a posting on her official MySpace page.Wrote Jiroux: