Magnolia Bakery at Rock Center didn't open yesterday as planned, but a sweet surprise is in store for anyone around Radio City this afternoon: celebrity cupcake-shilling! TLC's T-Boz, reality star Khloe Kardashian, and Playboy Playmate Brande Broderick will all sell cupcakes to raise money for charity and promote the Donald Trump vehicle, Celebrity Apprentice. [Midtown Lunch, Cupcakes Take the Cake]