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.

Celebrity hairstylist Jesus Guerrero, known for working clients such as Kylie Jenner, Jennifer Lopez and Katy Perry, has died, his family announced. He was 34.

Jesus Guerrero, a celebrity hairstylist who counted Kylie Jenner, Demi MOore and Jennifer Lopez among his clients, has died. He was 34.