Charlotte Gainsbourg is always impeccably well dressed, after all what else would you expect from the daughter of Jane Birkin (yes, as in the namesake of the Hermes Birkin) and Serge Gainsbourg? The French actress/musician, who recently starred in Lars von Trier's "Melancholia" with Kirsten Dunst, Kiefer Sutherland Alexander Skargard and Charlotte Rampling, turns 40 (!) today, proving that being chic is has no expiration date. Take a peek in our gallery below for some serious style eye-candy: