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In between dates on his “Seen It All” tour, Jeezy touched down at Brooklyn’s Barclays Center on Thursday for Power 105.1′s Powerhouse 2014.

During his set, the Snowman surprised the crowd by bringing out BK’s own Jay Z to perform “Seen It All.” Mr. Carter got in the Halloween spirit, wearing a Jason mask over his head, while trading verses with Jeezy. Beyoncé, dressed in her own Janet Jackson-inspired costume, watched from backstage.

Before leaving, Jay Z issued a PSA:

“I’ve got one announcement tonight: Real ni**as is back in style.”

In addition to the rap titans, Chris Brown, Trey Songz, J. Cole, Ne-Yo, Tinashe, and more graced the stage during the star-studded concert.

Watch Hov’s Halloween surprise below.