Prince released two new albums yesterday (Sept. 30)—Art Official Age and PlectrumElectrum (the latter recorded with his band 3rdEyeGirl) and celebrated by doing a livestream special with Yahoo.

Prince brought out Kendrick Lamar to perform "What's My Name," a cut from 1998's Crystal Ball box set. Kdot performed a new verse for the occasion. Via Miss Info, Prince and K.Dot have an unreleased record together, which Prince’s engineer previewed for the crowd that night. Could it be for the West Coats MC upcoming album?

You can watch a short clip of Kendrick's appearance above.