EXCLUSIVE: Kylie and Kris Jenner Respond to Criticism Over Monthly Subscription Fees for Kardashian/Jenner Lif

Kylie Jenner is defending charging her fans a monthly fee of $2.99 to access her new lifestyle mobile app.

The 18-year-old reality superstar and her famous older sisters Kim Kardashian, Khloe Kardashian, and Kendall Jenner all launched new websites and mobile apps on Monday --- with Kourtney's coming soon -- giving their fans an inside look into their lives that not even their reality shows can show. The apps, which include a mix of subscription and free content, comes out to a yearly fee of $35.88, or $143.52 if you want all the sisters' apps.

Not surprisingly, plenty of Keeping Up with the Kardashians fans aren't happy about the monthly subscription fee -- especially given how open the Kardashian sisters are on social media. But when ET caught up with Kylie at the Vera Wang Spring 2016 fashion show during New York Fashion Week on Tuesday, Kylie called the fee "not that big a deal," considering what actually goes into the app.

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"I put so much time into it," Kylie stressed, talking exclusively to ET. "And it's stuff that I would never choose to share in a million years, but deep down I want my true fans to know, like all my personal stuff and tricks -- stuff that I would never share on Instagram. So if they want to know real personal stuff that, like, makes me a little uncomfortable to share, then I don't think it's that big of a deal."

"And I feel like if my true fans want to know personal stuff, " she added, "then it's just how it is."

ET also caught up with Kylie's mom, Kris Jenner, on Tuesday, who also defended the fees her daughters are charging.

"For less than a cup of coffee, fans can get exclusive, original content that they won't get anywhere else about fashion, beauty, health, parenting. Each of them has employed teams of editors and videographers to work with them in shooting, curating and creating experiences to share with fans, capturing their passions, unique voices, experiences, lessons and likes," Kris explained. "The content is funny, sad, inspiring, deeply personal and gives subscribers an inside look at Kourtney, Kim, Khloe, Kendall and Kylie's lives that you just can't get in a television show once a week a few times a year."

"This has been a non-stop job for them and, in a way that is revolutionary, bring their voices and passions to a global audience of millennials who navigate the world almost exclusively through digital platforms," she added.

When ET asked Kylie which one of her sisters' apps is her personal favorite, she herself couldn't decide. The Kardashian sisters have been vocal about launching five different apps instead of one, in order to showcase their different personalities.

"I mean they're all so amazing and so different -- that's what's so great about it," Kylie said. "Kendall's is more documentary style, she's always on the go, so it's more behind-the-scenes of a model life. Kim's is very cookie cutter, clean -- hers is super well-done. Khloe is just so fun, and she really, like, tells you what it is. She's just so relatable, so that's what great about her."

WATCH: Kylie Jenner Denies Breast Implant Surgery, Reveals Her Secret to Ample Cleavage

Watch below to see one video that's getting plenty of attention on Kylie's new app -- her revealing her secret to getting that ample cleavage look.

Kylie Jenner Says She Hasn't Had a Boob Job, But Reveals Why Her Breasts Look So Big

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