Sofia Richie Celebrates Machine Gun Kelly's Birthday

Sofia Richie heads back to her car after doing a little shopping in Los Angeles on Saturday afternoon (April 23).

After some retail therapy and lunch, the 17-year-old model headed to celebrate pal Machine Gun Kelly‘s birthday.

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“Happy birthday to this monster ???? love you bigg time @machinegunkelly,” Sofia shared on Instagram.

She wrote later on, “Last one! So happy we could all b together to celebrate yuh nugget.”

15+ pics inside of Sofia Richie…