Chances are if you're tired and/or stressed out your skin will show it by breaking out or becoming severely dehydrated. The key is to not overdo makeup in either instance. Keep it looking radiant with a tinted moisturizer that has a nice healthy sheen to it (try Laura Mercier Tinted Moisturizer, $42). If you're oily try a mineral powder foundation. -- Streicher
Cream blushes are great way to make skin look healthy and glowy. Apply on apples of cheeks and a tiny bit on your temples. One to try: Stila Convertible Color, $24. -- Babaian
We all know the great looking skin mantra: drink plenty of water, stay away from sugar, salt and alcohol and get plenty of rest. But we also know that these things aren't always possible. Late nights and early mornings are inevitable, so for times when sleep isn't an option, use these expert tips to help you look awake and refreshed. You'll have everyone fooled into thinking you got your required eight hours.