A paternity test has revealed Lindsay Lohan's father has another daughter.

The 'Liz & Dick' star's dad Michael Lohan appeared on 'The Trisha Goddard Show' to find out whether 17-year-old Ashley Horn is the actress' half sister and he now wants to get to know the teenager after a sample of his DNA proved positive.

He told RadarOnline: "While I am sorry this took so long, we finally have the answer, we are all okay with it and we will deal with it in the best way!"

Michael, 52, - who has four children with ex-wife Dina Lohan including his 26-year-old actress daughter and is currently expecting a baby with his 29-year-old girlfriend Kate Major - allegedly avoiding taking the test for four years.

Ashley's mother Kristi Horn pushed for the test but she Ashley told the show: "I don't want to be part of the Lohan trainwreck."

She also attacked Michael for refusing to acknowledge her in the past.

She said: "What gives you the right to tell me that the kids have a right to disown me. What made you say that to me? How can you keep lying?"