Justin Bieber surprises pal Ariana Grande’s fans when he showed up onstage during her Miami, Florida concert. He, however, felt the need to apologise to Ariana because he messed up the lyrics, even though no one really noticed.

While Grande was performing at the American Airlines Arena on Saturday for her Honeymoon Tour, fans were surprised when Bieber suddenly joined her onstage as she started to sing her single “Love Me Harder.” Bieber took over the parts originally performed by The Weeknd, but he forgot the words. Before anyone could criticised him, however, he immediately apologised to Grande after the song ended. "So I feel bad, I forgot the words, Ariana," he said. "I've been trying to memorize them backstage for like an hour!"

Grande played the sport and told him not to worry as "nobody heard." The two then performed a duet of Bieber’s “All That Matters” and 2012 hit song, “As Long As You Love.” Grande performed the rap parts originally performed by her boyfriend Big Sean. On Saturday night, Bieber took to his Instagram to say sorry again to Grande and express how much fun he had performing.

Bieber also tweeted a message that implied he is missing having his own tour and would probably have one soon. He addressed Miama and said he is “not done yet.” The last tour Bieber did was his “Believe” world tour, which took place from 2012 to 2013.

Meanwhile, while Ariana is busy with her tour, rumours back home about her are still churning. Her camp even had to defend her against rumours of her being a diva on the set of “Scream Queens” even though she had not set foot on the New Orleans set of the said TV show. According to the rumours, Ariana Grande is feuding with Emma Roberts on the set of “Scream Queens.”

A Fox Studio rep stepped out and released a statement to VH1, clarifying the untrue reports, saying the singer is on tour and will still need to “hit the stages” of the show. Therefore, the rumours cannot be true and the network is still excited to work with her.

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