Sofia Richie Does Some Retail Therapy at Barney's New York

Sofia Richie goes for a comfy look in jeans and a sweatshirt while shopping at Barney’s New York on Sunday afternoon (September 4) in Beverly Hills, Calif.

The 18-year-old model, and girlfriend of Justin Bieber, was seen jumping for joy – literally – outside the store with some guy pals.

That same day, Sofia took to Instagram to post a photo of herself by a window.

“Seconds before I brutally attacked @darrendzienciol,” Sofia captioned the pic, which you can see below.

15+ pics inside of Sofia Richie shopping at Barney’s with friends…