He 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.

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

Soon after the show of affection, Big Sean was thought to have tweeted, ‘This kid is about to learn not to touch my girl like that. Beliebe that.’

But TMZ heard from sources that the tweet was a fake and that the rapper was never mad at the Baby singer.

Ariana was dressed in one of her trademark skimpy costumes for her California gig, showing off her killer legs in a pair of sparkly hotpants paired with a matching crop top.

As she finished off her look with a pair of her favourite spangly animal ears and some super high heels, 21-year-old Justin couldn’t keep his eyes or hands off the star.

As Ariana belted out her verses of Love Me Harder, the hit-maker wrapped his arms around the pretty pop star, nuzzling into her neck.