Justin Bieber Surprises Again at Ariana Grande Show!

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Justin Bieber made another surprise appearance at an Ariana Grande show!

NEWS: Justin Bieber Says You Asked For It, Performs with Ariana Grande in Miami

The singer shocked fans by joining the "Problem" singer onstage at The Forum in Inglewood on Wednesday. The 21-year-old pop stars sang Grande's song with The Weeknd "Love Me Harder" together before Bieber took the stage solo to perform his track "Where Are You Now."

NEWS: Justin Bieber Is Hitting the Stage for the First Time Since 2013!

Grande then returned for a duet performance of Bieber's hit single "As Long As You Love Me."

A few times the two seemed to get a little bit flirty, with Bieber putting his arms around Grande's waist, which made the fans in the crowd absolutely freak out!

This marks the second time Bieber has taken the stage on Grande's recent tour. He also made a surprise appearance at her Miami concert just two weeks ago.

WATCH: Justin Bieber -- Selena Gomez Inspired A Lot Of Music On My New Album

While he performing with his pal Grande, Bieber has said that his new music is heavily influenced by his relationship with ex-girlfriend Selena Gomez. See more in the video below.