We thought Angelina was long over her goth phase. Even if it's just another weird "Salt" wig, this Morticia Addams-meets-Gandalf the Grey look is a DON'T – except on Cher.
Speaking of Cher, someone better tell Fergie to snap out of it. Her usually golden lovely lady locks look frumpy sporting this dark hair DON'T.
DO wear your hair in a ponytail when hanging out with ponies. We're talking to you, Katie Price, and your little horsey friend, too.
Lily Allen's flattering up-DO is the most elegant we've seen the typically hot mess-ish singer look in a while – and that makes us *smile.*
Paging Sarah Jessica Parker: DON'T wear a wig that looks exactly the same as your real hair but for some reason is a wig.
If you look closely, the phrase "SEXILY BLONDE" is spelled out in Reese Witherspoon's luscious, Farrah Fawcett-esque locks. Subliminal hair messages are a MUST DO!
Even if you're fresh out of rehab, it's hard to seem like a brand-new woman when you've been sporting the same hairstyle since 1999. Tara Reid's tired "American Pie" teen 'do is a 30-something DON'T.
When you want to be perceived as a grown up, serious actress, cutting your long locks into a chic bob like Hayden Panettiere's is a DO (but clubbing, PDA sessions with random rebound dudes and red carpet meltdowns are always DON'TS).
DON'T grow out your bangs in front of the camera like style-misguided ingenue Amber Tamblyn. DO wear a barrette – or get subtle, temporary extensions. Jeesh.
DO match a pale white complexion with a jet black widow's peak and parted, glistening red lips for a "Twilight"-inspired vampiress-tressed look like Fran Drescher.
Edie Falco's cropped peroxide hair is a DO if, and only if, you're shooting a remake of "The Legend of Billie Jean." Otherwise, just DON'T it.
Stringy, fried extensions and multiple reddish streaks? Save your tween tresses and DON'T take any more tips from Lindsay Lohan. It will only lead you on the path to hair ruin, Miley – save yourself!
The perfect symmetry of "90210" star Jessica Lowndes' cleavage and hair-part seems like a definite DO in our book.
Audrina Patridge may be at one with her shirt, but she is clearly at odds with her hair. It seems to be two vastly different lengths on either side. Playing with scissors is always a DON'T, ladies.
DON'T wear an "Anne of Green Gables" ensemble like Jena Malone unless you've got the long red pigtail braids to accompany your old-timey dress. Her pixie 'do is more suited to a mod, punk or grunge look. Just sayin'.
A word to the wise – and Celine Dion: DON'T match your hair color to your bronzer. As the Quebecoise would say, "Tres gauche!"