Pregnancy isn't slowing Nicole Richie down.

At last night's Esprit store opening in Santa Monica, hosted by Nicole and Joel Madden, she announced that her belly isn't the only thing growing: She's also expanding her fashion line.

"I'm going to be doing apparel, accessories and footwear, so that's really exciting," she told E! News.

What else is the couple up to these days?

Giving back...the event benefited their children's charity foundation.

"It's always been important to us," Joel said of their philanthropy. "It's how I was raised."

Seems he was also raised a gentleman. Inside the party, Joel stayed by her side the whole night as she sipped bottled water. He even escorted her to the bathroom.  

No doubt he'll be holding the door open if they hit up Charlotte Ronson's party for her JCPenney collection tonight.

For more on Nicole's new fashion line, head over to her website.

—Additional reporting by Chris Hall

For more stars turned stylish designers, check out our Celeb Fashion Lines gallery!
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