She is expecting the baby with rocker Matt Bellamy, who proposed to her last week.
The 31-year-old star continued to work after she gave birth to her son Ryder, seven, from her marriage to Chris Robinson, but she is adamant she will now be more choosy about film roles so she can spend more time at home, reports dailystar.co.uk
"I will have the baby to look after and Ryder is at an age where it’s so fun with his baseball and karate. If I work, I’ll have to go away from that and I don’t want to miss another second of it," she said.
"I’ll carry on working but only if the film’s really special. Maybe this is the time in my career where I shift focus and spend more time at home. It’ll be interesting," she added.