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They might not have the same name-in-lights cache as Hollywood's hottest celebs, but top beauty pros have an impressive, under-the-radar way of creating cool, groundbreaking trends that we can't wait to try. Plus, they're never without clever hair and makeup tricks, can boost our natural beauty in an instant, and, without a doubt, they always have the ultimate insider scoop on products that really work. In other words, when a beauty guru makes a recommendation, we listen. So, we asked some of the top experts in the biz—think: Bieber's hair maven, Janelle Monae's manicurist, and The Real Housewives of NYC's Cindy Barshop—to reveal the essentials they can’t live without. Here’s what they had to say, start taking notes!