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.

Guerrero’s family announced the news of his death via Instagram on Sunday, Feb. 23. The hairstylist was 34.

“Jesus’ death hit her hard,” an insider tells PEOPLE of Jenner, 27. “She is shocked and very upset. Still, she’s doing everything she can to be supportive and aid his family, including financially.”

The source continues, “As upset as she feels, she knows it’s so much worse for his family. She doesn’t want them to stress about money. She’s taking care of expenses, including those associated with his funeral.”

Kylie Jenner and Jesus Guerrero. Kylie Jenner/Instagram

Guerrero has worked with Jenner for years and recently styled her in Paris for Couture Fashion Week, and for the 2025 Golden Globes. The mogul’s most recent photo with Guerrero was posted on her Instagram on Feb. 12.

Aside from Jenner, Guerrero’s other celebrity clients had included her sisters, Kendall Jenner and Kim Kardashian, as well as Katy Perry, Rosalía, Demi Moore, Charli xcx, Camila Cabello, Dua Lipa and Lisa of BLACKPINK.

In a series of Instagram Stories on Feb. 23, Guerrero’s family shared the news of his death as well as a heartfelt tribute. His cause of death has not yet been revealed.

“Our family would like to thank everyone for all the love and support during this hard time. Jesus was the brightest light, we have never doubted that he touched the hearts and lives of everyone he came across,” they wrote alongside an image of Guerrero sitting on a beach.

Kylie Jenner and Jesus Guerrero. Jesus Guerrero/Instagram

“We have fallen into tears repeatedly reminiscing and wondering what we could of done different to still have him with us,” the statement continued.

In a second post, which featured an image of Guerrero hugging a tree, his family said, “Seeing everyone’s loving posts, fills and tears our hearts all at once. If anyone has videos or photos they’d like to send to us through here we’d love every frame.”

Jesus Guerrero. Jesus Guerrero/Instagram

Along with a final photo of Guerrero walking the streets of Paris, the message concluded: “I don’t know how the world will go on without his light but I know he’ll give us the strength to push past any obstacle. RIP Jesus. We all love you.”

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In a GoFundMe page, Guerrero’s younger sister Gris said her sibling died “suddenly and unexpectedly.”

“It is with a heavy heart that we let the world know that Jesus Guerrero has gone to heaven,” she began. “He is a son, a brother, an uncle, an artist, a friend, and so much more.

As of Feb. 24, the GoFundMe page has raised over $93,000 of its $80,000 goal.

The Wall Group, who represented Guerrero, didn’t immediately respond to PEOPLE’s request for comment.