Hov and Diddy spotted Monday walking in the “Late Show With David Letterman” show. Where is Dirty Money?

Rapper Jay-Z’s secret New York City performance is reportedly back on today despite being called off by the mayor last week. According to reports, Jay will be performing alongside Eminem on a Manhattan rooftop.

The rapper has taken to the rooftop of the Ed Sullivan Theater this afternoon to rehearse a surprise show with Eminem — just days after the mayor canceled his planned performance from the theater’s marquee. The two are currently strolling the rooftop and doing microphone checks for a taping of the “Late Show with David Letterman” later this afternoon, sources said. The NYPD said a permit was not required for the rooftop performance. (NY Post)