Nicole and Ashlee: Barney's Beauties

Nicole Richie and Ashlee Simpson go shopping together at Barney’s Beverly Hills on Thursday.

Ashlee, 23, will be making an in-store appearance at the Zellers store at Square One, in Mississauga, Canada, on Saturday Aug. 23 for the relaunch of the Request clothing line. Simpson was chosen for the advertising due of her “hip” persona which reflects the brand’s personality, said Geoff Hardwicke, Zellers director of marketing.

Nicole, 26, is now launching a Web site for the charity that she and boyfriend Joel Madden started – the Richie Madden Children’s Foundation.

“The Web site will be a registry, like for a bridal or shower registry, where low-income women list things they need for their babies,” the source said. “More well-off people will then go on and buy stuff for the children,” a source told the NY Daily News.

15+ more pics inside of Nicole Richie and Ashlee Simpson going tandem shopping…