Playboy founder Hugh Hefner has died at 91.
The magazine announced the legendary figure's passing on Wednesday night, indicating that he died at the Playboy Mansion by natural causes, and stars almost immediately took to social media to pay their respects.
Former cover stars like Kim Kardashian, Jenny McCarthy and Donna D'Errico were some of the people that honored the legend on Twitter, thanking him for welcoming them into the "Playboy world" and helping with their careers immensely.
Other stars the mourned Hefner's death were Larry King, Gene Simmons, Nancy Sinatra, Rob Lowe and many more.
RELATED: See photos of Hugh Hefner from throughout his life:
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