These celebs should know better, but Leighton's made a HUGE face faux-pas!

Ladies, I'd like to hand you one of the most solid beauty tips you'll ever receive. It's an obvious one, a firm favourite in every make-up handbook, but it seems some certain starlets haven't been paying attention so it's time to re-inforce...

Heavy eyeshadow and heavy lips DO NOT GO!! I repeat: Do not mix your red lipstick and your smokey eye. However, after seeing these pictures of the usually gorgeous Leighton Meester at an American Eagle preview party, we're guessing she never got that memo...

Oh Leighton... did your mirror fail you?

With all that red lippie painted on and purple around the eyes, you wouldn't believe this is the same lady that plays the sophisticated Blair Waldorf! She should have gone with a heavy eye and a nude lip OR a simple eye and a bold lip.

Have you ever committed any cosmetic crimes? Dare we ask, do any of you maybe even like this look?

Comments please!