Rat’s Nests & Crimped Catastrophes -- The 20 Worst Celebrity Hollywood Hairdos

Sure Britney, Lindsay, Kim and Paris might have fame and riches -- or at least one of the two! -- but they're certainly not immune to bad hair days like the rest of us! Check out this gallery of the 20 worst celeb hairdos.

Amanda Bynes has been wigging out a lot lately, but this blonde mess that she wore to court really got her attention!

Britney Spears had some of the worst extensions ever, as the result of her infamous head-shaving nightmare.

Christina Aguilera went overboard with the big perm look early in her career.

Kelly Osbourne’s current lilac hair hue isn’t everyone’s favorite, but in her younger years these hot pink and purple streaks in her jet black hair were a whole lot worse!

Kate Moss took platinum blonde to the garish extreme!

Helena Bonham Carter looked like she had a rat hiding in her nest at this red carpet event.

Lindsay Lohan was in desperate need of a brush and shower.

Pamela Anderson showed off her bed head gone wrong, with this awful do.

Courtney Love takes stringy to the extreme!

Juliette Lewis tried out the purple hair look, which didn’t quite suit her.

Kim Kardashian got caught on the rare day she didn’t have her hair professionally done.

Janice Dickinson looked like she just rolled out of bed with this disastrous 'do.

Paris Hilton wasn’t looking so hot, showing off her extensions.

Rainbow Brite or Avril Lavigne?

The Cousin It look wasn’t Sofia Vergara’s best.

Goldie Hawn looked majorly wind blown while riding in a limo.

Claire Danes didn’t bother to brush her blonde locks, hitting the streets with a messy mane.

Even Salma Hayek used a crimper back in the day!

Dakota Fanning wasn’t quite camera ready with her stringy hair style.

Kourtney Kardashian’s hair looked wild after she was hit with a gust of wind.