The Weeknd surprised the crowd at the Vevo Presents concert in Los Angeles last night (Dec. 17) by bringing out none other than Kendrick Lamar.

The two got the fans dumb hype, performing their duet "Sidewalks" off the XO singer's latest album, Starboy.

The track is one of the fan favorites off the album. The Canadian crooner previously spoke about working with K. Dot on the song during an interview with Zane Lowe. “[Kendrick Lamar’s] a genius. He is really a genius,” said Abel.

“He’d walk around. He’d play the record over and over again," Weeknd continued, revealing the TDE rapper's recording process." I played him songs, the Starboy theme of course, which he incorporated into his verse. He would just walk around. We had food. He’s writing his verse in his head. He would go into his phone, look at it a few and then put it back and start walking around. He then at one point he went into the studio booth and I closed the door and I could hear him yelling his verse in his head. He was really committed, you can tell he put his all into. It wasn’t just a random Kendrick Lamar verse, it was something special because again, I don’t like to say this all the time, but we’ve known each other for a while and it’s crazy how we started connecting on this record.”

Check out more footage from the Vevo performance, below.

The 20 Best Album Covers of 2016