The Calvin Klein pop-up event with Amazon Fashion kicked off with a bang.

Those who attended day one of the event were treated to games, prizes, exclusive product drops, as well as a wide range of interactive attractions; however, the highlight of the pop-launch caught most attendees completely off guard: It was the surprise performance by CK collaborator ASAP Rocky.

Flacko hit the stage Friday night at NYC’s Flatiron Plaza, where the three-day market is currently going down. He performed a medley of new and old records, including “Praise the Lord,” “L$D,” “ASAP Forever,” and, of course, “Raf”—a track named after CK’s chief creative officer Raf Simons.

You can check out footage of Rocky’s performance below.

The CK x Amazon Fashion event will continue throughout the weekend. It will end at 10 tonight, and reopen at 11 a.m. Sunday.

As part of the immersive activation, CK released its limited edition “ASAP Rocky Trucker Jacket”—a piece Rocky recently discussed with Complex.

“There are always conversations on how we can partner. Ideas flowing back and forth,” he said about the origins of the collaboration. “I know this is a first for a CK Jean Jacket so it’s a special one. We needed to make something to always be able to remember this moment. I like that CALVIN KLEIN is creating something tied to a real NYC moment—it is accessible to everyone, and it’s in my hometown. Hopefully my fans like that my album Testing art is at the center, it’s fire!”