Sara Foster, Demi Moore, Tallulah Willis, Nikki Erwin and Erin Foster

Photo Credit: Vivien Killilea for Getty Images

In Hollywood, a celebrity following (or lack of one) can make or break your brand. If the A-list turnout at Nikki Erwin‘s Established jewelry line launch party is any gauge, there can be no dispute about which category her brand falls into.

Demi Moore, Gwen Stefani, Rachel Zoe, Molly Simms, Joanna Garcia Foster, Hilary Duff, Jennifer Meyer and Roger Federer were among the celebrity guests at Erwin’s launch party at Soho House West Hollywood on Friday night, which was hosted by Erin and Sara Foster. Meyer’s presence in particular was important, as Erwin was her very first employee at just 19 years old.

Gwen Stefani and Jennifer Meyer

Photo Credit: Vivien Killilea for Getty Images

Guests at the fete previewed and shopped the debut jewelry collection, nibbled on bites including wild mushroom flatbread, burrata crostinis, and crab cakes, and sipped cocktails including Moscow Mules and Eastern Standards while mixing and mingling.

Erwin’s collection of 14K and 18K gold pieces range from $225 to $28K; she is also the designer behind Donatienne handbags.

Nikki Erwin and Roger Federer

Photo Credit: Vivien Killilea for Getty Images

Nikki Erwin