Cardi B surprised fans at a release party for Pardison Fontaine’s “Under8ted” mixtape on Tuesday by taking the stage with Fontaine at legendary club SOB’s.

Fontaine helped write some of Cardi’s hits. Later, Cardi and another NYC rap icon, Fat Joe, grabbed dinner at Tao Downtown before she headed to the venue’s nightclub and hung out in the VIP area with Fontaine “dancing and having a good time with friends.”

They stayed till 3:30 a.m., listening to music by DJ Clue, DJ Shortkutz and DJ Stacks.