Beyoncé
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My fellow Beyoncé freaks will relish the information I recently learned about her from designer Rubin Singer, who dressed her for a private Vegas concert on New Year's Eve: She's as lovely, polite, and generous as you were hoping. In fact, Singer says she and sister Solange Knowles are "the only celebrities that always dry clean and send clothes back in a box, with a hand-written thank you note. They are true ladies."

The process of creating a custom piece for Bey is as hectic as you might think--Singer had just two weeks to design the unitard, have the fabric embroidered in India, shipped back, put together, and customized at the fitting (which, incidentally, took place in the bathroom at the Alvin Ailey dance studio). "When you do a fitting with her, she doesn't keep you waiting half a day like some celebrities do," he says. "When she's there, she's present and honest and grateful."

That's not the only upside of designing for Beyoncé: "She and I have had a working relationship now for about five years," Singer says, "and in that time, I've been invited to every concert she's had in New York, she's introduced me to people she thinks I should work with, she and her team are just incredibly generous people."

Click here to see the outfit Singer designed for Beyoncé.