Kylie Jenner is a worried woman! The fact that her boyfriend Tyga and HIV positive actor Charlie Sheen had once been involved with the same transgender pornstar in the past, has left her scared.

Pornstar Mia Isabella, who in September had claimed she enjoyed a relationship with rapper Tyga, had also been with Sheen, who only earlier this month revealed that he was diagnosed as HIV positive, reports mirror.co.uk.

"As soon as Kylie's mom, Kris (Jenner), found out about Tyga's connection to the same transgender woman that Charlie was involved with, she went ballistic,` In Touch magazine quoted a source as saying.

`For obvious reasons, Kris insisted that Kylie get to the bottom of this potentially life-threatening mess. So Kylie went straight to Tyga and confronted him,` the source added.

However, according to reports, Tyga has denied any involvement with the pornstar.

Tyga and Mia were first linked after a naked picture of the rapper, reportedly sent to Mia, appeared online.