Watch Justin Bieber and Ariana Grande Perform Together in L.A.

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Ariana Grande performs onstage at Madison Square Garden on March 20, 2015 in New York City.  

Justin Bieber and Ariana Grande are making something of a habit with their surprise duets.

Justin joined Ariana for her show Wednesday night at the Forum in L.A. for a performance of Ariana’s My Everything song “Love Me Harder”. Bieber stuck around for a solo job of his song "Where Are You Now" and the pair joined forces for a duet of Bieber's 2012 track “As Long As You Love Me." 

Watch Justin Bieber and Ariana Grande Perform Together in Miami

About two weeks earlier, the twosome surprised everyone in the room when they teamed-up on stage in Miami. On that occasion, which marked Bieber’s long-awaited return to the stage, they performed Love Me Harder” “All That Matters,” and “As Long As You Love Me.”

The next chance they’ll have to get-together on stage will be Friday, when Ariana’s Honeymoon Tour plays the Honda Center in Anaheim, California. Bieber and Grande are both managed by Scooter Braun

On the same day, Bieber shared the L.A. stage with Ariana, the Canadian pop idol shared a nugget of news with his millions of Twitter followers. He’s “working on music.”

Bieber is getting into the swing of all things live. He's already been confirmed to headline the Fusion Festival in Birmingham's Cofton Park this August.