A number of celebrities have expressed their grief over the death of comedy legend Joan Rivers.

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The Fashion Police star died on Thursday afternoon from a reported cardiac arrest and a number of performers and entertainers have mourned the comedian, including singer Kelly Osbourne. She posted a photo of the two of them together where Osbourne smiles for the camera.

"I love you with all my heart @Joan_Rivers my life will never be the same with out you!" she wrote adding in a Facebook link where she referred to Rivers as "the only grandmother" she ever knew.

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"Joan, thank you for taking me in and loving me as a daughter," Osbourne added. "I will miss you deeply and will always hear your voice in my head saying 'my darling get out there and be you!'"

Here are some other celebrity reactions:

"Thanks for keeping us humble. If you couldn't laugh at yourself, Joan would make us laugh at you. RIP @Joan_Rivers"- Michael Buble

"Though her death is no laughing matter, Joan Rivers' life was nothing but... We Will always love you"- Dolly Parton

"@Joan_Rivers said: 'We all mourn in our own way. I mourn with a great steak.' Tonight I'm going with the fillet. #RIPJoanRivers"- Dane Cook

"RIP Joan Rivers. Being publicly told that my dress is hideous will never feel quite as awesome. You will be truly missed"- Anna Kendrick

"Dear #Joan Rivers, you didn't stop. You didn't disappear. You didn't cave. Thank you for being true & for doing the heavy lifting. RIP."- Emma Caulfield