These celebs’ major hair malfunctions will make you wonder what they did to piss off their stylists, if they even have one.

Christina Aguilera has sported a lot of questionable hairstyles over the years — from multicolored highlights to crazy cornrows — but her current bleached-blond bob loses major points for lack of originality since it’s pretty much a rip-off of Lady Gaga’s signature style. And just like lace face masks and circle lenses, there are certain things only Gaga can get away with.

Technically, Britney Spears‘ worst hair moment of all time was when she decided that she didn’t need any and shaved her head. Sadly, things don’t seem to have improved much since her hair has grown back. The pop star constantly steps out with ratty extensions that make her look like she has the mange.

At first we thought that Mena Suvari was wearing some kind of strange hat, but after a closer look, we can confirm that the thing sitting on her head is indeed her hair. And the worst part: The updo is French braided up the back, prom-style. That’s two major hair offenses rolled into one horrifying look.

It’s hard to believe that there was a time when we totally coveted Mischa Barton’s mane. Those sun-kissed highlights! Those glossy waves! If the O.C.’s Marissa Cooper, could see the star now, we’re certain that she would like, totally barf, over these fake-looking, Barbie-esque extensions.

When Kelly Osbourne first dyed her hair lavender we actually thought it looked kind of cool. But now that the color is more gray than purple (not to mention those lunch lady-inspired curls), the only place that this look would be considered trendy is on a box of Betty Crocker.

In all fairness, Katherine Heigl had to dye her gorgeous blonde hair dark brown for a movie role, so we won’t rag on her about the color. But what’s her excuse for this ’80s-news-anchor-meets-politician’s-wife bouffant? We can only imagine how many cans of hair spray had to die to achieve this helmet hairdo. Aqua Net® Professional Hair Spray anyone?

As the mother of four children, it’s entirely possible that Heidi Klum didn’t have enough time to blow-dry her hair before running to this red carpet event. However, we have a very bad feeling that her wet-looking, slicked-back style was done intentionally.

Taylor Momsen’s Rapunzel-goes-Goth extensions are so long and straggly, we actually miss that weird mullet cut she used to have (and that’s saying a lot). Oh, and no one was even remotely surprised when the wannabe rock star recently told mtv.com that she doesn’t brush her hair.

If you stood on Cassie’s left side, you would assume that she had a lovely head of hair. And you would be half right. The singer shaved one side of her head, writing on Twitter “sometimes in life you need a change.” Yeah, that’s what a few face-framing layers or some pretty highlights are for.

At first we thought that My Bloody Valentine actress, Jaime King, was headed to a costume party, where she dressed up as some sort of alien with crazy hair. But she actually sported these finger-in-the-socket curls to an awards show. Yikes!

We’re usually fans of Rihanna’s envelope-pushing style, but we just couldn’t get behind her cherry Kool-Aid colored, half-shaved bowl cut. (Just writing that made us woozy.) Luckily, her hair is starting to grow out and our fingers are crossed that her next look won’t be quite as aggressive as this one.

Maybe arriving at the London premiere of The Back-Up Plan with her hair styled in a way that can only be described as “fancy bird’s nest” was Jennifer Lopez’s misguided attempt to distract people from the rom-com bomb.

Who do you think sported the worse celebrity hair?

Rachel Bilson played the loveably shallow Summer on “The O.C.” Her character embodied the stereotypical wealthy Californian brat who spent her day at the beach and stores like Target were a mystery to her. So it is a bit of a blow to see her looking a bit busted.

I am not sure if it’s the dress, bad lighting or what that is making her look a bit disheveled. I want to walk up to her and pull up the bra part of her dress so that her boobs are being squished and pulled down. That might be a start. This was a dress that looked fab on the runway during Fashion Week, but not so fab here.

I will give her the benefit of the doubt and say it’s bad lighting.

I remember when Mischa Barton was the tall, lanky blonde on Fox who had such a bright future. What happened? Theories run abound including drug abuse, eating disorders and bouts of depression. Whatever it is, I hope she finds herself.

Cellulite is an awful creation. No is perfect and cellulite effects everyone. Mischa Barton is currently the butt of jokes that focus on the imperfections of celebrity bodies. It is a collection of fat under the skin that gives the appearance of dimples.

It is more prominent in women, but men do suffer from cellulite as well. Your genes, your gender, the amount of fat on your body, your age, and the thickness of your skin are all associated with the amount of cellulite you have or how visible it is.

Some false facts associated with the annoying lumps have surfaced. Don’t fall prey to them.

Cellulite Reduction myths include drinking tons of water. FALSE over hydration has been proven to INCREASE the appearance of the cottage cheese effect. Liposuction removes it. FALSE, it can actually make it worse. The procedure removes the fat layer under the fibrous tissue, thus making it appear more dimpled.

To combat the bumps you can watch what you eat and decreases body fat. However, it won’t eliminate the cellulite. There is no miracle cure to rid yourself of it, but there are several options to minimize it.

Rubbing coffee grounds is the latest trend to surface. After enjoying your morning cup of coffee, rub the used grounds on your problem areas and wrap them with plastic wrap for several minutes. Exercise, massages and a healthy diet are your best bets when treating the issue. Always stick to what makes you feel healthy and happy.

Bangs were big in 2007, and this tress trend is showing no sign of slowing down. If you’re considering the look, use these celebrities as inspiration: sleek and sexy like Tyra Banks, long and choppy like Reese Witherspoon, an updated pageboy like Katie Holmes’ and everything in between.

When R&B star Rihanna wanted to get “a little edgy,” she went for a blunt bob with bangs. When style icon Kate Moss chose bangs, the trend officially started. Katie Holmes upstaged hubby Tom Cruise with her new Suri-style haircut at Germany’s Bambi Awards.

Sienna Miller kept her Edie Sedgwick-inspired short do even after filming wrapped on Factory Girl. Lovely Liv Tyler likes her bangs thick and blunt. Post -OC, Mischa Barton is vying for grown-up movie roles and is definitely looking the part.