Nicole's Winter Delivery

Fri., Jan. 11, 2008 5:56 PM PST by Sarah Hall

Nicole Richie's got a whole new life on her hands, and it's a lot less simple.

The former reality star and her fiancé, Good Charlotte frontman Joel Madden, welcomed their first child together, daughter Harlow Winter Kate Madden, Friday at Los Angeles' Cedars-Sinai Medical Center, E! News has confirmed.

The child weighed in at six pounds, seven ounces and was apparently quite healthy, as the proud parents have already left the building.

"The beautiful healthy baby girl left the hospital with her ecstatic parents," a rep for the couple told People.

Nicole's dad, Lionel Richie, and her half-sister, Sophia, were spotted arriving at the hospital Friday afternoon, where they joined a small entourage eagerly awaiting the little one's debut. Lionel's wife, Brenda, reportedly arrived a little earlier with two others, flanked by plain-clothes security.

Their new addition also capped off a celebrity baby boom at Cedars Friday, as Christina Aguilera, Courtney Thorne-Smith and David Alan Grier's wife were all bearing down elsewhere in the maternity ward today. Aguilera gave birth to her and hubby Jordan Bratman's first child right around the time Baby Madden was born.

Richie and Madden have been dating for a little over a year. After rampant speculation about the SImple Life star's swelling physique last summer, they confirmed they were expecting during an August interview with Diane Sawyer.

"I actually didn't even really believe it until I heard the heartbeat," Richie said of learning she was with child.

Though the pregnancy was unplanned, Richie has called her situation "a blessing in disguise."

"I owe this baby my life. I owe this baby everything, and I have a responsibility now for someone else," she told Sawyer. "I have to set the right examples. I want to be the best parent I can be. I would really want to be someone my child would look up to."

Over the course of her pregnancy, Richie has been doing her best to put her money where her mouth is.

Harlow Winter Kate may be barely a few hours old, but she already has a nonprofit to her name.

In honor of their firstborn, Richie and Madden created the Richie-Madden Children's Foundation in November, with the goal of giving back to other young families in the community.

The new parents hosted a holiday party last month at Paramount Studios, treating nearly 200 disadvantaged kids and their parents to Christmas presents.

Earlier in the month, the twosome also held a baby shower at which they passed out gifts to 100 new and expectant moms in need.

Richie's Simple Life sidekick Paris Hilton told E! Online the couple plan on tying the knot later this year. And Richie herself has said she is anticipating a "really huge" wedding.