updated 07/29/2011 AT 4:00 PM ET
•originally published 07/29/2011 AT 5:00 PM ET
Aaron Johnson is getting ready to pull double-daddy duty – his fiancée, filmmaker Sam Taylor-Wood, is expecting the couple’s second child, her rep confirms to PEOPLE.
After stepping out together as a couple last spring, Johnson defended their relationship. “I’ve got a wonderful woman. I’m an old soul, and she’s a young soul.”