While an updo like this should give Jennifer Connelly's beauty a chance to shine, instead she looks like she has the flu. Her ungroomed brows, washed out skin and dry-looking lips cry out for chicken soup and a box of tissues. A little bronzer or blush and a swipe of lip color would improve things greatly.

Rihanna's stunning beauty manages to peek through this cluttered assembly of bad hair extensions, tight braids (ouch!), brassy highlights, severe eyebrows and garish eyeliner. But it's a battle. Rihanna, are you in there?

This chic little bob and simple makeup palette give Rihanna her due. Remember: beauty needs framing, not fussing.

With her tawny highlights, shiny hair, glowing skin, huge sparkling eyes and dimpled smile, Mischa Barton was once the epitome of the magnetic girl next door.

It's hard to believe this girl, with her stringy hair, unflattering hair color, heroin-chic eye makeup and washed out skin is the same Mischa Barton. Experimenting is great, and playing with new looks for special occasions is totally in bounds. Just make sure it's always flattering. Many a celebrity has proved that stringy hair isn't flattering on anybody.