Radar 9/20: The Pop Culture Periscope

This week brings the official start of autumn — and with that comes great TV. We’re looking forward to the “Dancing with the Stars” premiere tonight. We’ll be watching to see if Brandy has the moves. Also, we’re planning to pick up John Legend and the Roots’ new CD, “Wake Up” — out on Tuesday. And what week would be complete without birthdays? Join us this week in saying “Happy Birthday” to the beautiful Lisa Raye and the talented Will Smith…