Nicole Richie has adopted a lifestyle rich in vitamins and designer maternity wear in preparation for her second pregnancy.

According to a report featured in the January 12 issue of Star Magazine, the former reality star and longtime boyfriend Joel Madden are trying to get pregnant just weeks shy of daughter Harlow’s first birthday.

“Nicole simply told Joel that she wants another baby —right away,” says a friend. “He was a little overwhelmed at first, but now he’s with her 100 percent. They’re both thrilled about adding to their family.”

Nicole and Joel went through a “rough patch, but now things are amazing between them,” says the source. “Nicole knows it’s because they’re both so happy with Harlow, and she truly believes another baby will double their commitment.”