All good things must come to an end and it looks like Katy Perry might be the one to stop Eminem's record-setting run at the top of the Billboard 200 albums chart. As expected, Perry's Teenage Dream will block Eminem from lodging his eighth week at #1 on next week's Billboard chart by selling 192,000 copies of her second official major label album, or more than four times as many as her first disc, One of the Boys, sold (47,000) in its first week two years ago.