Nicole Kidman appears to have bunny lines in this shot (left) taken in 2008. But in a recent photo (right), her face is free of the telltale wrinkles. Photo: Getty Images

Botox, the injections that freeze wrinkles, can actually give you wrinkles.

Sounds like a cruel joke, right? Well, it's not.

As we previously reported, even when you paralyze the muscles that cause furrows, your face will still find a way to make expressions by using different areas than where you've had Botox -- leading to fine lines in new areas. These lines commonly crop up across the bridge of the nose and are known as 'bunny lines.'

Dr. Joshua Zeichner, a New York City dermatologist, tells StyleList "it's totally true!," and that as more stars with Botox are scrutinized, it's a side effect that's being brought to our attention. Last year, the telltale lines were spotted on many-a-celebrity, including Nicole Kidman and Renee Zellweger. But an inspection of recent photographs of these celebrities (see above) shows that they may have caught on.

"When you make facial expressions, it's a complex interaction of many muscles," Dr. Zeichner explains. "It's true that Botox will relax certain muscles to achieve a desired effect, i.e. to relax wrinkles or lift the brow. It takes an experienced injector to know how the Botox will affect the muscles that you're treating and the muscles that you're not."

"You're changing the natural balance and functioning of the body and injectors can either use that to their advantage or, if inexperienced, can cause new wrinkles to appear."

Luckily, with the right experience and a little patience, bunny lines can be prevented.

"I give a touch of Botox in the nose to prevent the bunny line effect when treating the furrow lines, forehead lines and crows' feet. This is where the art of Botox comes in -- when certain people have furrow lines treated, their faces will recruit more muscles to compensate when making expressions than others," Zeichner warns.

"Maximal effects of Botox kick in after two weeks, so I like to wait and see how a patient's muscles react and then treat each individual accordingly," says Dr. Zeichner. Seems like a sensible approach.

He suggests that inexperienced doctors may not know how to treat the "bunny line" effect -- so if you're currently getting Botox or thinking about it, investigate your doctor's experience accordingly -- and as with any procedure a patient chooses, you must weigh the benefits and risks.