The surprises keep coming at the Coachella music festival. On Sunday (April 13), Chance the Rapper invited an unlikely guest to join him onstage -- Justin Bieber!

The pop superstar, dressed in a huge black T-shirt, shorts and a bucket hat, performed 'Confident' with the Chi-City rhymer during his afternoon set.

Before Biebs exited the stage, the 'Baby' singer showed off his acrobatic footwork for the crowd.

Billboard reported that Chance the Rapper ended his set by thanking fans who have "favorited a tweet or retweeted me or follow me on Instagram."

After his surprise appearance, Bieber went on Twitter and tweeted:

Many of his Beliebers (aka his fans) were excited by the news that Biebs and Chance rocked the mic together onstage. Read the tweets below.