He may have already won the title of American Idol, but David Cook has returned to the show that made him a household name. The rocker, who beat out pop crooner David Archuleta on last season’s competition, performed his new single “Come Back to Me” for a thrilled audience, which will be featured on an upcoming episode of the Fox reality hit. David also received a surprise treat of his own — a platinum album of his self-titled debut CD. “Before Idol, it took me a year to sell 1,000 records, and now I am platinum in three months. Amazing!” a grateful David announced, clearly stunned that he managed to sell 1 million copies in such a short time. Prior to his TV breakthrough, the singer released a slow-selling independent album titled Analog Heart, which now commands up to $500 on eBay. It looks like there’s no stopping this shooting star!