Nicole Richie looked just swell as she showed off her post-baby figure at the launch of her fiance's new clothing range.

Motherhood has clearly given the 26-year-old's formerly skinny figure a boost - she looked radiant in a tight sliver dress at the launch party for DCMA Collective in Los Angeles on Friday night.

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Curvy: Nicole Richie at the DCMA launch on Friday

Blooming: The Simple Life star looks healthy and happy at her fiance's clothing launch

Boost: Motherhood suits the 26-year-old

And keeping it all in the family, Good Charlotte star Benji, brought along his new girlfriend - Paris Hilton, Nicole's best friend since childhood and her Simple Life co-star.

Nicole, who wore an "H" pendant around her neck, gave birth to Harlow Winter Kate Madden on January 11 but already looks toned enough to wear the most unforgiving material.

During recent years she has been through several figure transformations - from slender but curvy in the early series of The Simple Life to being painfully thin before her pregnancy.

She now appears to be in her element with her curvy but petite figure.

But, like Christina Aguilera, who gave birth on the same day as Nicole, her cleavage has been given a welcome boost by motherhood.

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Pre-baby: Nicole, seen here last spring, was criticised for being too skinny

While Nicole glammed it up and showed off her new fuller figure at the launch party, best friend Paris wore more casual clothes. The heiress showed up in an outfit from the very range that was being previewed - wearing a DCMA Collective Drip Drop t-shirt and Eighty-8 hoody.

Nicky Hilton, Christina Milian and Ja Rule also walked the red carpet at the event.

DCMA Collective is a collaboration between Good Charlotte brothers Joel and Benji Madden, their older brothers Josh and friend Tal Cooperman.

Paris at the 'DCMA Collective' flagship store grand opening in West Hollywood on Friday

Upfront: Christina Aguilera gave birth on the same day as Nicole Richie