Kendall Jenner Plastic Surgery: Rumors about Kim Kardashian's  18-year old younger sister's plastic surgery sparked when Kendall posted a photo on her Instagram account showing off her fuller lips.

Both Kylie and Kendall Jenner are half sisters of Kim, Kourtney and Khloe Kardashian, all three are surely familiar with plastic surgery.

Speculations began to circulate whether or not the young model and allegedly a pop star wannabe resort to lip injections to make her lips plumper.

According to a report from Fox News when they interviewed psychotherapist Stacy Kaiser, if Kendall indeed went into a plastic surgery this should be a cause for concern.

"As a teenager your identity is developing and so if you start getting this work done now it becomes part of who you are. You grow up thinking you need to enhance, alter or change your looks in order to be attractive," the psychotherapist explained. "I always say that kids learn what they live. Kendall learned that focus on appearance is critical so it makes sense that she would already be trying to enhance or alter what she looks like."

Look at the alleged pictures of Kendall plastic surgery:

On the contrary, Barry Weintraub, MD, a famous New York based plastic surgeon told Fox News that it's not unusual for teenagers to resort for cosmetic enhacements.

"Some teens, even at 18-year-old maturity are born with very [thin] lips... Then [it is] totally appropriately to conservatively augment the upper and/or lower lips with small amounts of Restylane, which is what it looks like she had," Weintraub explained.

Nevertheless, some specialists think that Kendall Jenner may not have resorted to the plastic surgeons to make her lips plump.

"Kendall has always had naturally aesthetically beautiful lips. They are ideal and we often have many young women come in requesting her lips. It doesn't appear that anything invasive has been done," as told by Dr. Raffi Hovespian, a Triple Board Certified Beverly Hills plastic surgeon. "This look can be attributed to pouting, lip gloss and lip plumper, which are more appropriate 'enhancements' for her age."

Kendall Jenner has 6.3 million Twitter followers and her opting to plastic surgery may not be a best idea as she is being looked up to by millions of her young fans globally.

"Kendall is a role model for a lot of young girls, they look up to her and they want to be like her," Kaiser added. "This may drive a lot of young girls to ask their parents to get the same thing done."

Representatives did not give any comments on whether Kendall Jenner did resort to plastic surgery.