Lindsay Lohan’s father insists he has proof that his ex-wife is covering up the extent of their daughter’s addictions.

Michael Lohan - who this week told of his fears that the Mean Girls starlet will be dead within a year - says the actress is on “death’s doorstep”.

And he says that Lindsay’s mother Dina knows this - but is trying to keep it a secret.

He said: Dina is saying that I’m lying - that Lindsay doesn’t have a problem and that she’s OK.

“But I have proof that Dina has told me Lindsay is on death’s doorstep, that she doesn’t have much time left.

“There have been frantic calls. And I’m going to prove that Dina is the liar, not me.”

He is said to have a series of phone recordings to back up his claims, and is expected to share them on a US television show next week.

He told a US newspaper: “I want her off prescription medication. I’m not going to stop until then.”

Lindsay, 23, has fought a high-profile battle with substance abuse and has entered rehab several times.

Michael officially got divorced from Dina - with whom he has three other children - in 2007.

A representative for Lindsay was unavailable for comment.