Sofia Richie Celebrates 18th Birthday With Justin Bieber

Does this make it official?

Justin Bieber was on hand for Sofia Richie‘s birthday festivities on Wednesday night in Los Angeles. The Biebs helped Lionel Richie’s daughter ring in the big 1-8, celebrating at both Doheny Room and the Nice Guy.

The model and social media star rocked a white crop top and black pants, while Bieber threw on some ripped jeans and a white T-shirt.

“Justin arrived with his guy friends around 10 p.m. Sofia joined him later and they stayed until after 1 a.m.,” an onlooker at Doheny Room told People. “They sat separately and had big groups with them.”

However, it seems they may have felt a bit more comfortable at the second location. A source inside the Nice Guy restaurant informed Yahoo Celebrity that the new couple seemed “very much together, but not crazy affectionate.”

“He seemed attentive, and she looked really happy,” the source added. “It definitely looked like a new relationship.”

We’re glad Sofia perked up for her birthday! One day before, the model shared a Snapchat from a doctor’s office, saying, “Of course I’m sick [the] day before my birthday. Anything else want to go wrong?” #modelproblems

Justin, 22, and Sofia first sparked rumors of a romance earlier this month when they seemed to take their relationship full throttle, jetting off to Japan together. However, many fans — including Selena Gomez — were not here for the social media PDA.

Fans posted nasty comments about his possible new girlfriend. Gomez also got in on the action, and it quickly turned into a war of words between the pair of exes, which resulted in Bieber quitting Instagram.

Related: Beliebers Missing Justin on Instagram — Get Your Fix Here

Think he can he stay away? We’re sure he’s dying to post a special birthday message to his rumored flame.