Justin Bieber and Ludacris reunite to perform 2010 hit 'Baby' in Atlanta

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INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses in the press room at the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Jason LaVeris/FilmMagic)
INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses in the press room at the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Jason LaVeris/FilmMagic)
INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses in the press room at the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Jason LaVeris/FilmMagic)
INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses in the press room at the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Jason LaVeris/FilmMagic)
INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses at the iHeartRadio Music Awards on April 3, 2016 in Inglewood, California. (Photo by Steve Granitz/WireImage)
INGLEWOOD, CALIFORNIA - APRIL 03: Justin Bieber poses at the iHeartRadio Music Awards on April 3, 2016 in Inglewood, California. (Photo by Steve Granitz/WireImage)
INGLEWOOD, CALIFORNIA - APRIL 03: Recording artist Justin Bieber accepts the award for 'Best Male Artist,' onstage during the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Rich Polk/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: (clockwise from bottom L) Singer Meghan Trainor, rapper Big Sean, recording artist Diplo, singer Justin Bieber and manager Scooter Braun attend the iHeartRadio Music Awards which broadcasted live on TBS, TNT, AND TRUTV from The Forum on April 3, 2016 in Inglewood, California. (Photo by Kevin Mazur/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: Singer Justin Bieber attends the iHeartRadio Music Awards which broadcasted live on TBS, TNT, AND TRUTV from The Forum on April 3, 2016 in Inglewood, California. (Photo by Kevin Mazur/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: Singer Justin Bieber performs onstage at the iHeartRadio Music Awards which broadcasted live on TBS, TNT, AND TRUTV from The Forum on April 3, 2016 in Inglewood, California. (Photo by Kevin Mazur/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: Singer Justin Bieber performs onstage at the iHeartRadio Music Awards which broadcasted live on TBS, TNT, AND TRUTV from The Forum on April 3, 2016 in Inglewood, California. (Photo by Kevin Mazur/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: Recording artist Justin Bieber performs onstage during the iHeartRadio Music Awards at The Forum on April 3, 2016 in Inglewood, California. (Photo by Jason Kempin/Getty Images for iHeartRadio / Turner)
INGLEWOOD, CALIFORNIA - APRIL 03: Singer Justin Bieber performs onstage at the iHeartRadio Music Awards which broadcasted live on TBS, TNT, AND TRUTV from The Forum on April 3, 2016 in Inglewood, California. (Photo by Kevin Mazur/Getty Images for iHeartRadio / Turner)
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Justin Bieber had Beliebers in a tizzy when he performed the song that put him on the map.

During the 22-year-old pop star's concert in Atlanta, Georgia, Bieber surprised the audience by bringing Ludacris onstage perform their 2010 hit, "Baby."

WATCH: Justin Bieber Gets Nostalgic, Shares Intimate Throwback Photo With Selena Gomez

"Reunited Rockin wit the Biebs. Surprised ATL tonight. #showkillas," the rapper proudly Instagrammed on Tuesday night.

Posting another photo of himself and Bieber onstage, he touted: "And the crowd goes wild...."

and the crowd goes wild....

A photo posted by @ludacris on

Beliebers did in fact go wild. "JUSTIN BROUGHT OUT LUDACRIS DURING BABY AND I'M CRYING BECAUSE I'M SO HAPPY BECAUSE IT BROUGHT BACK MEMORIES," one Twitter user posted along with a video of the performance.

Bieber has certainly grown up in the six years since the release of "Baby." During his Atlanta show, he showcased his muscles and multiple tattoos in a tank top with Tupac Shakur's face on it -- a far cry from the purple hoodie and floppy haircut he sported back then.

EXCLUSIVE: Justin Bieber Goes on 'Drunk' Rant During Impromptu Performance in Los Angeles

But after all these years, he's still singing "Baby" -- and so are his siblings. Check out Jazmyn and Jaxon's rendition of their older brother's hit song:

Justin Bieber's Brother and Sister Adorably Sing 'Baby'

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