ER star Goran Visnjic is being sued by a woman who claims that he is the father of her baby daughter.

Visnjic's childhood friend Mirela Rupic has said that she fell pregnant after having an affair with the actor last summer - but he refuses to acknowledge the child as his own.

Goran - who plays Dr. Luka Kovac in the hit medical drama - is married to Ivana Vrdoljak and the couple have an adopted child together.