(Photo Credit: David Becker/Kevin Mazur/Getty Images)

The obsession with the Kardashian family continues.

This time it's over 17-year-old Kylie Jenner and just how she gets those super-pouty lips. Jenner regularly posts selfies on social media featuring her sultry pout. But lately Internet speculation has been rampant about whether she comes by those lips naturally.

So the "Keeping Up With the Kardashians" star addressed her haters Monday on Twitter.

"How long are we gonna talk about this lip thing lmao," Jenner wrote. "Let's get a our lives together guys and talk about some important s***. Just talk about something new at least. I'm bored."

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Now, big sister Kim Kardashian is spilling Jenner's lip secrets; and, no, it has nothing to do with surgical injections.

Speaking to makeup artists Sam and Nicola Chapman of the YouTube makeup channel Pixiwoo, Kardashian gushed about her baby sis' buzzed-about lips.

"I go into her room, and I'm like, 'What liner do you wear?' because she only wears a lip liner, and then she fills it in [with the same liner]," Kardashian revealed in the video. "She doesn't wear lipstick or a gloss."

Then getting down to specifics, Kardashian divulged Jenner's liner of choice: "She goes between [M.A.C.'s] Soar and Spice [pencils]. I use Stripdown."

Unlike her sisters, Jenner also handles her beauty routine herself, Kardashian boasted.

"She's so good. She's so good at makeup," Kardashian said. "Every event, she only does it herself."

A photo posted by Kylizzle (@kyliejenner) on Oct 10, 2014 at 8:27pm PDT