Rachel Bilson lent her support to a fellow celebrity designer last night, turning out to attend the launch of Amber Valletta for Monrow at Ron Herman in LA. The girls posed for photos side by side, before Rachel ventured off to browse the collection. Rachel is familiar with fashion events, but she's also gearing up for a return to acting with her upcoming stint on How I Met Your Mother. Amber, meanwhile, has been focusing on building her career after modeling, and who better to ask about that than her good friend Kate Moss?

More photos of Rachel and Amber at Ron Herman, so