An insider tells PEOPLE that Jenner is "very upset" and supporting Guerrero's family "financially"Kylie Jenner is mourning the loss of a close friend.A source tells PEOPLE the mogul is "shocked" by the sudden death of her longtime hairstylist Jesus Guerrero.

Kylie Jenner has stepped in to help the family of her hairstylist who died unexpectedly over the weekend -- paying funeral costs and other expenses ... TMZ has learned.

My heart breaks for Kylie and everyone who loved Jesus the way we all did,” the Skims founder wrote in a statement on her Instagram Story Sunday.