What do you get when celebrities like Jon Lovitz, Sebastian Bach, and Lisa Rinna are transformed into singing sensations like Elton John, Adam Levine, and Britney Spears, while John Barrowman hosts, and Debbie Gibson and Darryl Hammond judge from the sidelines (with guest judges like David Alan Grier among others)?  You get ABC’s SING YOUR FACE OFF, a competition series airing back to back new episodes Saturday nights at 9/8c. The show is a ton of fun, and it’s a