• Justin Bieber, Ariana Grande

Justin Bieber, Ariana Grande (Photo : YouTube)

Justin Bieber is back. The 21-year-old YouTube sensation surprised everyone when he appeared on stage without any prior notice where Ariana Grande was performing live.

The concert goers at the American Airlines Arena on Saturday night got more than what they bargained for. The fans went nuts when Bieber made an entry on the stage, much to the surprise for Grande as well.

Like Us on Facebook

Bieber joined Grande for the duet on several songs, including Grande's "Love Me Harder" and Bieber's "All That Matters" and "As Long As You Love Me." Although Bieber did forget the lyrics several times, the crowd did not seem to mind at all and loved the two mega star's collaboration on stage.

"So I feel a little bad, I forgot the words, Ariana," said Bieber after giving an energetic performance, Daily Mail reported. "I've been trying to memorize it backstage for like an hour. I feel so bad, I'm so sorry."

Grande and Bieber showed an amazing chemistry on stage while performing. At one point, the two stood quite close to each other, staring into each other's eyes while belting out the number "Love Me Harder." After a brief intimate singing, the "Baby" hit maker broke away and showed some extraordinary dance moves around the stage while greeting fans on his way.

Since it's been a while that Bieber has given a live stage performance for such a massive audience, the fans and music lovers were thrilled to see him on stage. The Canadian singer was dressed head to toe in black including a reversed baseball cap along with a white jacket thrown over the attire while Grande sizzled in a white lacy super mini dress, leaving very less to the imagination.

Later, Bieber took to Twitter to declare his excitement and the fact that he misses being on stage. "Thank you @arianagrande and thank you Miami. I missed the stage. See u soon ;)," wrote the star. After a long gap, the mega star will be performing in front of a live audience at the Fusion Festival in Birmingham's Cofton Park this August.