Lindsay Lohan refuses to talk to her estranged father over allegations he has a lovechild - because he needs to "grow up".

Michael Lohan is at the centre of claims he has a 13-year-old daughter by his former mistress Kristi Kaufmann - which he denies.

And the Mean Girls actress refuses to discuss the case with her dad - and admits that she has had "enough with him."

She tells U.S magazine Marie Claire, "I don't know what's going on with it. I haven't asked him any questions. Apparently we've been in the dark for so many years. We've gone through enough with him. Enough is enough."

And Lohan insists she will not speak to her father again "until he decides to be a grown-up".

The two have been involved in a public argument since Michael Lohan revealed he disapproved of his daughter's close friendship with Dj Samantha Ronson. (c) WENN