Kylie, 18, responded to reports circulating online claiming she wants Tyga, 26, to return the money he borrowed from her when they were dating.
The reports also claimed that Kylie was "short on cash as a result" and now "begged" him to pay her back.
The star took to Twitter to respond to fans, and wrote, "Lies lies lies."
Tyga is yet to respond to the rumours.
Kylie dated the rapper on-and-off for the past few years before finally breaking it off earlier this month.