Article Description: How do they do it? How do your favorite celebrities always manage to look flaw-free fabulous? It seems like you never see so much as a hair out of place or a smudge in their makeup. Face it: they're the pros and looking good is what they do. Get in on the secrets of the stars with 5 beauty tips from former model Diane Irons. Our eDiets columnist is far from just another pretty face. She works on some of the most gorgeous faces around... and she's here to share what goes on behind-the-scenes.