Sarah Jessica Parker attended the world premiere of “Sex and the City: The Movie” in London sporting a long wavy hairstyle  topped off with a very eccentric green hat! The hat features a green theme with a large rose, foilage and green butterflies, what was she thinking?

Tilda Swinton is sporting a very over-bleached blonde short hairstyle, this style can be very cute but with Tilda Swinton’s damaged hair it just looks messy and needs a good comb, definitely one for the bad hair day list!

Mary-Kate Olsen attending the Metropolitan Museum of Art Costume Institute Gala, Superheroes: Fashion and Fantasy, wore her hair in a straight messy hairstyle for this event. Mary-Kate Olsen obviously didn’t take much thought into her hairstyle, its very casual and is slightly sculpted, and tucked behind her ears giving a messy effect. 

Mary-Kate Olsen obviously didn’t care what her hair looked like while attending the Chanel Dinner held at the Tribeca Film Festival. Her hairstyle is very drab and obviously did not take much planning! This style is more casual than anything and really does not fit well for this event, this girl needs some color!

Even Denise Richards is entitled to a bad hair day — or ten. Denise Richards is pictured here with chestnut colored straight hair swept into a partial updo hairstyle. This style was very popular in the 90s and still is today — if done right!

This style is so wrong for this gorgeous lady! Milla Jovovich is wearing a short hairstyle with a large ribbon and net combo for the retro-flapper look. Love her auburn hair and curls, but this style could have been much, much better if she would have gone for that retro hairstyle at a hundred percent.

Ashley Simpson cant make up her mind in this photo, to braid her hair, leave it down or put it in a ponytail so she decided to try all three!. This hairstyle is just all wrong for her and something she should wear around the house… A very bad hairstyle for her! Her earrings also make it stand out much more which draws attention to the bad hairstyle even more.

Jessica Simpson is showing off more than just her assets but also a long brunette hairstyle with chestnut highlights. This is a completely different hairstyle for Jessica Simpson in this picture which is normally bright blonde locks of hair. However the bright red lipstick and the tan just doesn’t fit her! This hairstyle is very simple, long and layered a very sexy look.

Jessica Simpson stopped to pose with her short straight hairstyle and huge rose on the right side. While normally this style would really be cute, the flower is just one of the things that makes it under the bad hair day list. Jessica Simpson literally looks like her grandmother dressed and styled her hair for this event. She needs a new stylist!

Paris Hilton obviously finished watching reruns of Charlie’s Angels her bleach blonde hair and huge layered waves are too extreme for this heiress and her small features.