August 25, 2016 05:00 PM

Justin Bieber saw to it that new flame Sofia Richie celebrated her birthday in style.

Richie rang in her 18th year with Bieber at celebrity hotspot Doheny Room in West Hollywood on Wednesday night. The couple partied at the lounge and left together, but stayed away from any public displays of affection.

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

The celebration followed a Snapchat the previous day in which Richie revealed she wasn’t feeling well. “Of course I’m sick [the] day before my birthday,” the model posted from a doctor’s office. “Anything else want to go wrong?”

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However, the daughter of Lionel Richie and Diana Alexander Richie was able to muster up enough energy to kick off the birthday festivities by dining with friends later that night.

Reporting by MELODY CHIU

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