LOS ANGELES, CA - MARCH 20: Recording artist Justin Bieber performs at the 2016 Purpose World Tour at Staples Center on March
Jeff Kravitz/FilmMagic

The world of the two Justins collided last night, when Justin Bieber decided to cover one of Justin Timberlake's biggest hits. During his Brooklyn tour stop at Barclays Center for the Purpose World Tour, JB performed an acoustic rendition of "Cry Me a River" from 2002's Justified.

Donning a bandana wrapped around his head (yet another homage to Tupac?) and ripped jeans, Bieber strummed his acoustic guitar as he sung the emotional revenge tune while his female fans couldn't hold in their yelps.

Last night wasn't the first time the singer has performed "Cry Me a River": last month he did an acoustic version during his Louisville, KY tour stop and he also sung the tune way back when he was rocking that purple hoodie and tousled bangs at age 15.

As for the OG Justin? He recently made a return with his new single and Trolls soundtrack cut, "Can't Stop the Feeling." Watch the fan footage from Bieber's concert below, and click here to check out our roundup of Justin Timberlake's best live covers.