Super forces are joining! Taylor Swift and Beyonce got jiggy wit it while watching Jay Z at Justin Timberlake's concert in Brooklyn on Sunday -- and it seems as though as onlooker caught the hot mamas shaking it up!

On Sunday, the gals, along with a sold-out audience, got to see Timberlake during his hit 20/20 Experience World Tour at the Barclays Center last night.

Bey's hubby Jay Z took to the stage for their "Holy Grail" collab -- and the sizzlin' ladies couldn't contain their excitement. Check it out!

It seems as thought Taylor had quite a Jay and Bey-tastic weekend. T-Swizzle posted pics from her 25th birthday party on Friday night and it looks like Jay Z, Beyonce, Justin Tilmberlake, Karlie Kloss, Sam Smith and Haim were all partying it up together for the "22" hitmaker's soiree.