Justin Bieber & Sofia Richie Celebrate Her Birthday Together

Justin Bieber keeps a low profile under a baseball cap while making his way out of Doheny Room down a flight of stairs on Wednesday night (August 24) in West Hollywood, Calif.

The 22-year-old “Sorry” singer followed out his girlfriend Sofia Richie, 18, who celebrated her birthday that evening.

PHOTOS: Check out the latest pics of Justin Bieber

Earlier in the night, Sofia was seen leaving The Nice Guy.

“18-new beginnings,” she captioned an Instagram photo, which you can see below.

40+ pictures inside of Justin Bieber and Sofia Richie out for her birthday…