Michael Lohan, Lindsay Lohan's father, is convinced that his daughter has started drinking again under the influence of her rumored girlfriend Samantha Ronson.

Just last year Lindsay checked into rehab following a spate of drunk-driving wrongdoings, but now she seems to be back on the Los Angeles party scene with DJ Ronson.

Michael Lohan has vehemently blamed Ronson for “corrupting his daughter.”

“Samantha drinks and passes the drinks under the table to Lindsay, and behind the scenes it gets worse and worse. Sam is using my daughter,” he said. “My daughter isn't working because she's always with Sam. Even my ex-wife knows it. She just isn't doing anything about it.”

What is a father to do? “It's (got) to the point now that I'm going to confront Samantha and Jenny Muro (Lindsay's production assistant) myself,” he said.

A representative for Lohan said, "This is totally a lie and untrue."