Justin Bieber teased The Wanted star Siva Kaneswaran by flirting with the singer's fiancee in front of him.

The Baby hitmaker shares the same record label with the British pop stars and even recorded a song with the group after they were introduced by manager Scooter Braun in 2009.

However, Bieber fell out with Kaneswaran after he deliberately flirted with the Brit's fiancee, Nareesha MCCaffrey, to provoke a reaction.

Kaneswaran tells Britain's Daily Mirror newspaper, "Justin sat beside Nareesha, put his arm around her and said: 'Yo Siva'. He nodded at me and kissed her on the cheek.

"I was like, 'You're an absolute a**e. Why'd you do that? You're in for it.' After, every time I saw him he was scared. Bieber is going through a phase. He's a cheeky kid."

The Wanted's duet with Bieber was dropped from the band's last album over fears the R&B sound did not fit in with the rest of the songs.