The 31-year-old has been using Kris' money to finance his expensive spending habits.
A source told OK! Magazine that he’s “running up a small fortune” for Alexis, and Kris wants to put a stop to his spending.
The Keeping Up With The Kardashians star has been sending his lady love "designer clothes and huge bouquets."
Rob and Alexis started dating last month after flirting on social media. He called the Instagram model his "Woman Crush Wednesday."
But things got a bit rocky when she got into a brawl with Rob's ex and baby mama Blac Chyna just a few days later.
To read more about how Rob is treating his new girlfriend, pick up the latest edition of OK! Magazine, in stores now!