For those of you who enjoy a good celebrity sighting outside of the ranking member of some Senate subcommittee, you might want to venture down to Chinatown this afternoon. We’re told Jay-Z will be stopping the flagship AT&T store there. The rapper/mogul will be taking part in a live broadcast of Big Tigger’s WPGC 95.5 radio show from 2 to 6 p.m. prior to his performance at the Verizon Center this evening. And if you aren’t interested in seeing Jigga, you now know why there’ll likely be an up-tick in foot traffic around 7th and H streets NW today.