According to FemaleFirst, the 38-year-old actress was seen last week with a friend exiting a maternity clinic in Los Angeles with photos from a sonogram.
A source stated, "She is absolutely thrilled. She has always wanted to be a mother, she’ll be fantastic. Her family are so pleased."
The British star called her boyfriend Matthew when she left the clinic and then told her friend,
"Matthew tells me I should be quiet so no-one hears me."
Driver has previously dated other celebrities such as Matt Damon, whom she co-starred with in Good Will Hunting, John Cusack, and there were rumours that she was engaged to magician Criss Angel.