They might look like supportive sisters, but it looks Kendall and Kylie Jenner are having a hard time getting along behind closed doors. Rumor has it that Kylie is bitterly jealous about Kendall's recent success as one of the most sought-after models in the fashion world these days.

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According to Hollywood Life on Friday, Kylie is feeling rather upstaged by her sister, as she is getting a lot of attention for her work both on and off the runway.

A source said, "Kylie's bitter that Kendall is doing better than her and it's driven a wedge between them. Kylie has never been interested in modeling as she feels like that is Kendall's thing."

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The source added, "Still, she will do it from time to time if offered especially if it is artistic and cutting edge. She's not interested in doing the standard fashion magazine shoot."

Still, Kylie supposedly can't help but feel left behind while her older sister gets wined and dined by some of the biggest names in the fashion world.

The source continued, "Kendall is jet-setting around the world with her celebrity friends, while poor Kylie is at home moping around. She feels like the black sheep of the family and completely left out."

Meanwhile, there are reports suggesting that Jenner might have worn butt pads to the Grammys this past weekend.

According to Life & Style Weekly this past Monday, there were plenty of whispers going around that Jenner is desperately trying to morph into her older sister while enhancing her looks and in some cases, her body parts.

The site wrote, "We're not saying she's wearing butt pads, but we're not saying she's NOT wearing butt pads, either."

The site added, "But now it seems as though Kylie might be trying to distract us from her drastically different face by showing off curves that - we're sorry - she just didn't have before."

Tags: Kylie Jenner Kendall Jenner