The couple met on the set of Joy Division movie "Control" in 2007 and they went on to marry. Riley has now confirmed Lara is expecting the couple's first child, reported Telegraph online.
"I'm delighted," Riley said.
Lara, who appears in new Formula 1 movie "Rush", is due to give birth later this year.
The German actress has refused to divulge the gender of the baby, but revealed she is experiencing a number of pregnancy cravings.
"I could eat so much: burgers and ice cream, you name it," she said.