Sofia Richie celebrates her 18th birthday with Justin Bieber

Sofia Richie's rumoured new boyfriend Justin Bieber returned home to Los Angeles just in time for her 18th birthday. The duo were spotted on Wednesday (Aug. 24) evening hanging out at celebrity hot spot The Doheny Room.

Sofia, whose father is legendary singer Lionel Richie, made headlines earlier this month when she jetted off to Japan with the Canadian pop star.

The couple's reunion came days after the Love Yourself singer was seen partying with budding model and friend Bronte Blampiedin the UK. Back stateside, Justin rang in Sofia's birthday at the California lounge, arriving at about 10 p.m. and leaving a few hours later.

TAP FOR GALLERY Photo: Instagram/@sofiarichie.

The birthday girl sported black pants and a white bandeau top for the night on the town, while the 22-year-old donned a casual T-shirt and ripped blue jeans.

It’s been a week of festivities for Nicole Richie’s little sister. On Tuesday, Sofia was seen partying at 1OAK LA with family and friends, including stylist Chloe Bartoli.

stolen from @richieupdates.. BTW the cake range with the suitcase Chloe, Darren you are my 2 favorite idiots

A video posted by Sofia Richie (@sofiarichie) on

Prior to the celebrations, Sofia announced on Snapchat that she was feeling under-the-weather. She shared a picture from her doctor's office, writing, "Of course I'm sick day before my birthday...Anything else want to go wrong?" Judging by her Instagram posts later on, it’s safe to say her day turned out great.

CELEBRITY KIDS TURNED MODELS

While at 1OAK, the model was serenaded by hip hop artist Kent Jones and was presented with a cake in the shape of a Range Rover by club owners Richie Akiva and Darren Dzienciol. Sofia took to Instagram to extend her appreciation to everyone who celebrated with her.

“Thank you to everyone who came out last night and made my birthday something special,” she wrote. "It means the world to have people who will go out of there way to make you feel special. I'll remember this night for the rest of my life, I love you guys.”

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