Oprah filmed her show in Central Park today (it's not her first time going live from New York), getting visits from Mayor Bloomberg, Mariah Carey, Hugh Jackman, Regis & Kelly, and more. Plus, she was all decked out in her Mad Men-era clothing (side effect of having Don Draper and his missus appear on your show, we suppose). The episode from uptown airs today at 4 p.m. (but you're at work, right? So you'll have to catch the re-run at 1 a.m.); the Mad Men episode airs Monday. And for all you subway readers, she picked Say You're One of Them by Uwem Akpan as her next book club book, though it sounds a little too intense for a commute.