The 22-year-old star debuted on the photo-video sharing app after 24-week by posting a T-Mobile commercial for the Super Bowl.
In the video, Bieber acted as a celebration expert and wanted people to say goodbye to limits. Near the end of the clip, the "Cold Water" singer showed off his dance moves.
"Let me see your #unlimitedmoves," he captioned the clip.
He also restored his account, with past photos intact.
Back in August, Bieber had slammed fans after they criticised his then rumoured girlfriend Sofia Richie on Instagram.
The singer later got into a war of words with his ex Selena Gomez.
However, during one of his concerts in November last year, Bieber vowed to stay away from the social media for good. "Who thinks I should get my Instagram back? Nah, I don't want to get my Instagram back. Instagram is for the devil," he told the crowd at the time.