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Watch Taylor Swift And Beyoncé Dance At Justin Timberlake's Concert

Jay Z joins JT onstage while Jessica Biel looks on lovingly.

Justin Timberlake turned Brooklyn's Barclays Center into a celebrity hotspot on Sunday night, when he brought his 20/20 Experience World Tour to New York City. Not only was wife Jessica Biel groovin' along in the audience, but Taylor Swift and Beyoncé danced their butts off too. At one point, tourmate and collaborator Jay Z joined JT onstage for "Holy Grail."

Last year, Justin sang on Jay Z's Magna Carta Holy Grail album while Jay featured on JT's "Suit & Tie" before the dynamic duo embarked on their Legends of the Summer tour together. So naturally, when the Memphis native came to Jay's town, he got the full treatment. As a Carter family friend, JT was sure to get support from Beyoncé too, who danced feet away from Swift.

Taylor got down with the ladies of Haim, who were among the people who celebrated her 25th birthday on Saturday -- including Jay, Bey and JT.

During "Holy Grail," Swift was spotted twisting around and singing directly to Bey, who, in turn, raised her hands up and bounced along.

Timberlake's wife, Jessica Biel, who is rumored to be pregnant, looked on proudly, too.

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