An unknown attacker gained access to Justin Bieber's Twitter account this past weekend and remained in control for about 15 minutes.

The unauthorized party accessed the pop star's account mid-afternoon on Saturday and tweeted multiple times before Bieber's team regained control, according to Inquisitr.

The tweets said: “Justin Bieber Cemberut?” Cemberut is an Indonesian word that roughly translates to “sullen.” A link to an authorization page for an app, ShootingStarPro, also accompanied each tweet.    

Once his feed was cleaned up, Bieber sent out a warning to followers advising them not to click on the link in case of malware.

Although the unauthorized party hasn't been confirmed, one tweet was directed to a separate user @notescepotanem, who tweets in Indonesian and broken English.