lindsay lohanNot that Michael Lohan was in the running for father of the year, but his latest stunt may make him one of the worst. Lindsay Lohan found out she had a teenage half sister during a TV interview rather than hearing it from her dad.

On Good Morning America to promote her new Lifetime movie Liz & Dick, the star was asked what she thought about the latest development in her unending family drama. A clueless Lindsay gave the only answer she could.

Lindsay seemed to have no idea her father had just appeared on the Trisha Goddard talk show, where DNA results revealed he was the father of a 17-year-old girl he had never acknowledged. Poor girl. Mortifying right? Not for Lindsay. She didn't even flinch. "I didn't even hear that, so thanks for the news!" she quipped.

Sadly, she is far too used to her parents embarrassing her at this point. In recent months, her mother Dina gave a loopy and bizarre interview on Dr. Phil, not to mention her father's never-ending legal troubles. With all of her own legal and emotional ups and downs, she is right to ignore those headlines and just focus on getting her own life back on track.

Watch Lindsay's reaction:

 

How do you think Lindsay handled the news?