Justin Bieber can't keep his hands off Ariana Grande as he joins her on stage for another surprise rendition of Love Me Harder

Justin Bieber surprised Ariana Grande fans by hitting the stage for a sultry duet with the star during her Miami tour stop last month.

And it looks like Justin Bieber can't get enough of the spotlight, or his pal Ariana, as he joined the singer for another surprise appearance during her concert at The Forum in Inglewood, California on Wednesday. 

21-year-old Ariana bought out her long-time friend for a rendition of her hit Love Me Harder, with Justin taking on the verses originally sung by The Weeknd.

See another pics after the cut...