The 34-year-old model's body was discovered in a bathtub Wednesday, the report said.
The unidentified friend called police, reporting a possible drug overdose.
The circumstances surrounding her death are under investigation, but no foul play is suspected, TMZ said.
Lynn was the Playboy Playmate in February 2006.
LGBT community has 'bullied the American people': Bachmann
Attkisson leaves CBS News, reportedly over network's 'liberal bias'