Model Agyness Deyn is our modern day hair chameleon. She most recently shaved her head (left), sported sleek raven locks in 2009 (center), and debuted her career with a spiky blonde crop (right). Photo: Bauer Griffin | Getty Images

It's one thing to update your hairstyle regularly and keep it fresh and stylish. It's another thing to change it every time you step foot in the salon.

Or is it?

We've known plenty of women over the years (celebrities especially) who are constantly changing their looks. Blonde one day, brunette the next. Long waves to cropped bob to extensions. So, curiously, we wanted to find out what's going on inside the heads of these hair chameleons. In other words, when is continually changing your hairstyle about something more than just having fun with your locks?

It depends on your motive, says Los Angeles-based psychotherapist, Heather Turgeon.

"Hairstyles are one of the most obvious, defining changes women can make to their appearance," says Turgeon. "Constant changes don't necessarily reflect inner conflict -- it might mean that the person is interested in showing a different aspect of her personality."

However, when the way your hair looks interferes with your life or you find yourself stressing about it, Turgeon says this is a sign that someone has crossed the line.

Jason Low, stylist at the Serge Normant at John Frieda Salon's in New York and Los Angeles, agrees and says frequent style changes are often a red flag.

"Someone who is constantly changing her hair is either a natural chameleon whose aesthetic tends to run parallel to her moods, or she's searching for something and changing her look fills that need," says Low.

That "need" could be stress or feeling overwhelmed by a major life event.

"Changing hairstyles is really common during life transitions such as a break up or a new career," says Turgeon. "Our hair is something we can control, so it's empowering to make changes especially when you feel like other aspects of life are out of your control."

Pregnancy can also trigger some emotional hair decisions.

"One scenario I've seen play out for years involves women in their final months of pregnancy asking that their hair be cut off to make styling simpler for when they have the baby," says Low. "But then they return days later feeling exposed and unattractive questioning their stylists' judgment in making the cut. Granted that's not an example of someone constantly changing their hair, but it employs a stylists' responsibility to discern the cause of the change and to exercise good judgment."

Low's advice? Don't be impulsive and find a good hair stylist who won't let you do something you'll regret.

"There are always a few clients who consistently look for new styles each appointment -- usually going shorter and shorter each time or opting for a "bang" to feed the compulsion," Low says. "Eventually, there comes a time when haircuts need to be banned to grow hair as stylists need material to work with!"

Want an example of a major hair chameleon? Check out this model!