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Justin Bieber Joined Ariana Grande Onstage And She Rapped Big Sean's Part On 'As Long As You Love Me'

They sang 'As Long As You Love Me,' 'Love Me Harder' and 'All That Matters.'

For those waiting for Justin Bieber's big return, this may be it. The singer crashed Ariana Grande's Honeymoon Tour on Saturday night in Miami, and they duetted on Bieb's "As Long As You Love Me."

And since Ari's boyfriend, Big Sean, is featured on Justin's track, Ariana rapped his part.

They also performed Bieber's "All That Matters," off his Journals project.

And look at him dancing like crazy to Ari's "Love Me Harder"! He took fellow Canadian The Weeknd's place in the song.

And, of course, to top everything off. Here is Ari's brother, Frankie, who was at the Kids' Choice Awards, reacting to the whole thing.

Me too, Frankie. Me too.