Not many women would pose on the red carpet less than a month after giving birth, but former Playboy playmate Holly Madison did just that on Friday night.

The blonde beauty showed off her post pregnancy figure at Cirque du Soleil's "One Night for One Drop" Clean Water Fundraiser for World Water Day in Las Vegas. She strutted her stuff in a sleeveless blue dress with a leather belt cinched at the waist. She paired the look with black heels.

Madison and boyfriend Pasquale Rotella welcomed daughter Rainbow Aurora on March 5. She faced immediate backlash over the infant's name but stood by the moniker.

She explained on her blog: "There are a lot of smug haters out there who bag on my choice of a name, but I don't care about what they think. I want my daughter to be proud of who she is and learn to speak up and stand up for herself at a young age.

A couple weeks later she told In Touch magazine: "We want Rainbow to have lots of brothers and sisters. I'd love to have six!"