By PAUL CHAVEZ

The surprises kept coming at the Coachella Music Festival on Sunday as pop star Justin Bieber unexpectedly took the stage.

The 20-year-old Canadian artist took the stage on the third day of the outdoor music festival in Indio, California, making a surprise appearance with scheduled performer Chance The Rapper.

The Baby singer was decked out in hip-hop gear as he played hype man to 20-year-old Chance The Rapper, who was born as Chancelor Bennett.

Unexpected appearance: Justin Bieber joined Chance The Rapper onstage on Sunday at the Coachella Valley Music & Arts Festival in Indio, California

Young stars: Chance The Rapper and Justin are both age 20

Justin wore a black short-sleeved T-shirt with a thick chain and a black bandanna around his neck.

The pop icon wore an exceptionally loose pair of long grey shorts paired with black sneakers, finishing his outfit with a white bucket hat and black sunglasses.

Justin shared an Instagram video with his more than 50 million followers on Twitter that showed him dancing onstage with the rapper.

Having fun: Justin danced around onstage while Chance rapped

Justin did quick swivels on his heels with his arms in the air before launching into a multi-revolution spin.

Chance hit the stage wearing blue overalls with his left shoulder bared and a black Los Angeles Dodgers cap.

Justin’s apparently on-again 21-year-old girlfriend Selena Gomez also was spotted in attendance at Coachella on Friday.

Justin performs with Chance The Rapper onstage during day 3 of the 2014 Coachella Valley Music & Arts Festival at the Empire Polo Club

Hip-hop gear: Justin wore a white bucket hat, black bandanna and a thick chain over his black T-shirt

Dance moves: Justin displayed some of his dance moves for the audience

Hype man: Justin backed up Chance The Rapper during his performance

The Beauty And The Beat singer was spotted in Miami on Friday emerging early in the morning from a recording studio.

His performance came as a surprise to the celebrity-heavy crowd at the music festival and followed other heavy hitters who made unexpected appearances.

Coachella audiences over the weekend were treated to surprise performances by Beyonce with her sister Solange, Jay-Z with his former hip-hop rival Nas and Gwen Stefani who joined scheduled performer Pharrell Williams onstage.

Tough competition: Selena is spending time with her power girls, including Kendall Jenner

Romantic interest: Justin’s apparently on-again girlfriend Selena Gomez was spotted at Coachella on Friday

Head-to-head: Selena, Kendall and the girls seem to be having a great time