Ariana's boyfriend Big Sean was in Canada at the time, but saw pictures of the affectionate display almost immediately and called Justin out! The rapper's (now deleted) tweet read:
"This kid is about to learn not to touch my girl like that. Beliebe that."
Bieber himself probably didn't think twice about his behavior, tweeting after the show:
"Love the stage. Thanks for having me @ArianaGrande and thanks LA. Gotta tour again soon :)"
Do U think Justin was too affectionate during the performance? After all, the two are friends and were singing a love song — but if Ariana wasn't having it, then Justin should keep his hands to himself!
Check out some of the footage from one of the concerts Biebs surprised the crowd at in the video (below!)
Renowned humanitarian Angelina Jolie may not be as kind as everyone thinks she is -- especially when it comes to her estranged husband, Brad Pitt.
As surely know, following the shocking news that the Maleficent star had filed for divorce, the Fight Club actor was painted as a verbally abusive father and a potentially unfaithful partner. Tsk, tsk!