Actress Kristen Bell was out last week in Los Angeles to co-host Vanity Fair’s benefit for Invisible Children in Los Angeles and wore Vena Cava. Her dress, available at L.A.’s Ron Herman boutique for $460, was paired with an Invisible Children graphic tank top (which was launched during the event) and studded platform heels.According to the Invisible Children Web Site, the association was “motivated by the unseen war in Northern Uganda…created by three young filmmakers with a singular mission: To use the power of stories to change lives around the world.” Amazing.

Vena Cava designers Lisa Mayock and Sophie Buhai work out of their SoHo office, and the two L.A. born women designed their first collection on their living room floor after they graduated from Parsons School of Design. It all paid off as they were awarded an Ecco Domani in 2006 and received back-to-back Vogue/CFDA Fashion Fund Award nominations in 2007.

The line is adored by celebs like Rachel Bilson, Maggie Gyllenhaal and Liya Kebede.

For more information go to VenaCavanyc.com, and to learn about Invisible Children go to InvisibleChildren.com.

Photo of Kristen Bell courtesy by WireImage.