She's still grieving...

Yesterday, a somber Kelly Osbourne was seen carrying a pillow as she made her way from Los Angeles to New York City in order to mourn the passing of her fashion mentor Joan Rivers.

The 29-year-old had quite the connection with the late comedian, who was her E! Fashion Police co-star since 2010. The two formed a grandmother-daughter relationship that only grew over time, which showed itself on and off the camera.

"I'm completely heartbroken by the loss of my beloved Joan. Not only was she my boss, she was and will always be my teacher, therapist, closest friend, inspiration and the only grandmother I ever knew," Osbourne wrote, alongside a picture of the two.

"She was family and I will never forget her. Laughter will be difficult for a while but when I'm sad, lonely or upset all I will have to do is think of Joan and a smile will cross my face. Laughter is what she gave us and laughter is what she would want us to do in remembrance of her."

Osbourne also tweeted her grief over Rivers' passing, stating that life "will never be the same" without the star.