Kylie Jenner is making tons of money from her beauty lines. And it doesn't look like her successful streak is going to end anytime soon.

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Rob Kardashian has become the latest member of the family to work on a project with Kylie. The duo recently announced their joint sock collection, Kylie X Arthur George. There's one set with Kylie's face on them, while another says "I heart Lip Kits." That, of course, is a reference to Kylie's wildly successful makeup line.

Rob And Kylie Socks Rob Kardashian and Kylie Jenner have collaborated on a new sock collection.

This announcement came just months after Kylie announced her collaboration with Kim Kardashian. The siblings joined forces for a collection of nude Lip Kits titled The KKW x Kylie collection.

Kylie also previously launched a Lip Kit collection with Khloe Kardashian. And, of course, Kylie has worked with Kendall Jenner for years, teaming up for their PacSun, Steve Madden and Topshop lines, and their mobile game.

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The other Kardashians are smart for teaming up with Kylie. Her popularity has exploded in recent years. Her age, rebellious nature, and visual transformation have all become a winning combination. It's allowed her to tap into a demographic that few others have mastered.

Kylie was even named to Time's Most Influential Teens list last year. And in January, she was part of Forbes' "30 Under 30" list. The site concluded that she is already the second-highest earning member of her family, behind only sister Kim. She isn't resting on her laurels either, as she recently released a new sunglasses collection with Quay. 

Kylie Jenner Sunglasses Kylie Jenner's latest business venture is a line of Quay sunglasses (Photo: Quay Australia/Splash News).

Fans will get to see Kylie's business skills at work on her upcoming reality show, Life of Kylie. The eight-episode series, which premieres on E! next month, will document both her personal and professional life.

"Kylie's beauty, business savvy and fashion icon status have made her one of the most famous and successful young women on the planet," said Jeff Olde, Executive Vice President of Programming & Development at E!. "Kylie has achieved so much at such a young age and we know the E! audience will be thrilled now that she is ready to share an inside look at her everyday life."

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A source told People that some family members have "jealousy" about "all the attention that Kylie is getting." Working with Kylie is a way for the other Kardashians/Jenners to take advantage of their sister's popularity for their own benefit.

Are you surprised that Kylie Jenner has been so successful? Let us know your take in the comments section below!