Beyonce Knowles and hip-hop mogul JAY-Z are set to close out 2007 in style with a joint show in Las Vegas. News has leaked that the couple is planning to hit the stage at the opening of Jay-Z's new 40/40 Club in Sin City on 30 December (07). The pair has often appeared together for performances of their duets, but insiders insist the Las Vegas showcase will be a mini-concert based around both stars.