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Having a baby has done wonders for Nicole Richie.

Before she fell pregnant with Harlow, the former Simple Life star appeared dangerously thin and gaunt.

But after blooming during the pregnancy, she now looks in great shape and has maintained some trace of curves.

Granted, she's still pretty slender, but nowhere near as thin as her pre-motherhood figure.

She donned this red bikini while enjoying a break in Hawaii with boyfriend Joel Madden.

While Benji Madden and Paris Hilton may have split, his twin brother Joel and her best pal Nicole Richie continue to stay in stride as they head to lunch in the San Fernando Valley on Wednesday.