From left, Mary-Louise Parker of 'Weeds,' Laura Linney of the coming 'The Big C,' Edie Falco of 'Nurse Jackie' and Toni Collette of 'United States of Tara.'

From left, Mary-Louise Parker of 'Weeds, ' Laura Linney of the coming 'The Big C, ' Edie Falco of 'Nurse Jackie' and Toni Collette of 'United States of Tara.'

American actress Laura Linney is set to do double duty in front of the camera after signing on for lead roles in two new Hollywood films, the entertainment industry press said.