Nicole Richie and Joel Madden hosted a party for the kids from Beyond Shelter held at Six Flags Magic Mountain in Valencia, CA at the weekend.

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

Saying that the couple are doing quite well since the birth of their first child together, the insider adds, “Nicole knows it’s because they’re both so happy with Harlow, and she truly believes another baby will double their commitment.”