Kylie Jenner might have gotten an almost $300,000 Ferrari for her birthday from her boyfriend Tyga, but it looks like she's the one footing the bill when it comes to their relationship. There's a new report that says Jenner's sisters are concerned that she is spending way too much money on the rapper and are afraid that she might lose all of her hard-earned money before it's too late.

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According to OK! Magazine, Kylie supposedly pays for most of their very lavish birthday, as Tyga is allegedly hanging on to his sugar mama and not letting go.

A source told the site, "She pays for all their private jets, hotels, nights out, vacations, and now she's offered to fix up his $50k of rental arrears. Though she is worth an estimated $5 million, that net worth may quickly dwindle if she stays with her beau."

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What's more Kylie's sisters Kim, Kourtney and Khloe are looking to intervene before it's too late. Even though they've been supportive of Kylie dating Tyga, they don't want to see their little sister being used by the 25-year-old as well.

The insider added, "And while Kris and Kim have been supportive of her relationship, it remains to be seen how long that will last! It's really starting to upset Kim [Kardashian] and Kris but, with the exception of her new house, Kylie's spending more money on Tyga than she does on herself!" It's no wonder Kim previously begged Kylie to slow down their romance."

So far neither Kylie nor Tyga have made any comments about the report.

Keep up with Enstars for all the latest news on Kylie Jenner, Tyga and all of your favorite Kardashians.