Nicole Richie Looking Like Old Self Again

All 85 pounds' worth!

Just two weeks after welcoming daughter Harlow, Nicole Richie is already skinny again. That's what not ingesting any nutrients will do!

Clad in a tight black dress, Richie and her rocker beau Joel Madden joined her dad, Lionel Richie, at a birthday party Friday for her manager Benny Medina.

There's plenty to celebrate for the family: Medina recently brokered Nicole Richie's $1 million sale of the first pictures of little Harlow Madden.

This next part is sweet, though.

Joel Madden recenly blogged that he "had no idea what love even was until Harlow came along. I swear it's so hard to leave during the day, but always so rewarding to come home to the little family... She is growing so fast!"