After the queens, Beyonce and Nicki Minaj, unitedly slayed Tidal X’s charity concert last week in Brooklyn’s Barclays Center, Bey unleashed a delightful behind-the scenes  visual of their performance duet “Feeling Myself”.

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In the clip, you’ll see the ladies rehearse their “ice grill” moment and compete in a contest of “who cracks first”.  After several laughable attempts, of course, they perfected the stare and managed to look quite serious.

Who do you think cracks first?  Peep the clip below to find out!