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Justin Bieber, Sofia Richie

HEDO / AKM-GSI

Sofia Richie is continuing the birthday celebrations.

She and Justin Bieber were spotted hanging out at the Doheny Room in Los Angeles Wednesday night in honor of the model's 18th birthday. Earlier in the evening, Sofia and her friends hit up LA hotspot The Nice Guy. Bieber kept his look casual in jeans and a T-shirt while Sofia amped up her look with a white bandeau top and black pants.

"Many friends came out for Sofia's birthday. A lot of dancing and celebration went down," a source tells E! News. "She was fully taken care of with whatever she wanted. Justin was there but they were not acting overly PDA."

Aside from "some touching gestures," Sofia and Justin kept it "low key," the source adds.

Sofia's birthday week kicked off with a rocky start, as she revealed to her Snapchat followers that she was sick. "Of course I'm sick day before my birthday...Anything else want to go wrong?" she posted on Snapchat along with a photo of what appears to be a doctor's office. As the song goes, Sofia, "It's my party and I'll cry if I want to!"

Fortunately, her sickness didn't keep her down for too long, as she was spotted partying at 1OAK. A clubgoer told E! News that Sofia was joined by friends including Ty Dolla $ign and some family. Dad Lionel Richie and half-sister Nicole Richie skipped on the festivities. 

After midnight, Sofia jumped on the mic and announced it was officially her birthday, and then she was presented with a cake in the shape of a Range Rover. The birthday girl appeared happy and seemed to be having a great time surrounded by so much love. Kent Jones sang "Happy Birthday," and later she was seen singing along to his hit single "Don't Mind."

The Biebs, however, didn't attend these soirees either. But it looks like he more than made up for it by hanging out with her Wednesday night!