Many fans of Kylie Jenner have been surprised over how much her lips have changed as makeup artist Mario Dedivanovic posted an Instagram throwback photo of the "Keeping Up With The Kardashians" star.

In the Instagram photo, Mario Dedivanovic can be seen alongside Kylie Jenner whose lips are a lot thinner than they are now.

"What a huge difference a couple of years and little lip filler makes!" Hollywood Life noted about the Instagram throwback. "We're assuming the reality star was only 15 or 16 in this young photo! You can certainly tell Kylie made one very prominent change to her face - her lips."

Kylie Jenner is known for posting Instagram selfies that emphasize her lips.

The youngest of the "Keeping Up With The Kardashians" siblings have earlier denied that she has had lip fillers. However, her sister Khloe Kardashian has convinced her to be honest about her lips, as chronicled in their reality show.

"I have temporary lip fillers, it's just an insecurity of mine and it's what I wanted to do," Kylie Jenner admitted in a May 2015 episode of "Keeping Up With The Kardashians," as quoted by a previous report by Hollywood Life.

Though Kylie has only admitted to using lip fillers, there are speculations that she may have gone through the knife to modify other parts of her body.

"One popular speculation was if Kylie went under the knife to receive breast implants," Hollywood Life said. "However, the reality star denies that rumor. Kylie actually revealed in a video on her blog that she gets a little help from Victoria's Secrets bombshell bra to give off that illusion of large breasts."

"A really helpful push-up bra is certainly one way to help enhance your boobs. Not to mention Kylie has also admitted in the past to using duct tape to make her boobs look bigger," the report added.