Lindsay Lohan Threatens Media Over Boozing Reports

A source close to the actress tells TMZ ... Lindsay is already exploring her legal options with her attorneys ... because she feels the false stories are sabotaging her effort to save her career.

Lindsay acknowledges she WAS at the party at the Chateau Marmot hotel in Hollywood Sunday night ... but insists she was sitting with Alan Cummings the whole time and ONLY drank water.

We're told Lindsay's also upset over reports about a recent gas station makeout session with Dennis Hopper's son Henry, where she allegedly purchased Red Bull and vodka.