Watch Beyonce and Taylor Swift dance during Justin Timberlake and Jay Z's performance!

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Watch Beyonce and Taylor Swift dance during Justin Timberlake and Jay Z's performance!
So this is being 25..... #WHAT #bestbirthdayEVER
My birthday present from @lenadunham is my new most cherished possession.
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Beyonce leaves Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Beyonce leaves Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - DECEMBER 12: Jay-Z and Beyonce leave Taylor Swift's 25th birthday party at her Tribeca apartment on December 12, 2014 in New York City. (Photo by James Devaney/GC Images)
Beyonce, left, holds her "Video of the Year" award while Taylor Swift addresses the crowd at the MTV Music Video Awards, Sunday, Sept. 13, 2009 in New York. (AP Photo/Jason DeCrow)
Beyonce, left, holds her "Video of the Year" award while Taylor Swift addresses the crowd at the MTV Music Video Awards, Sunday, Sept. 13, 2009 in New York. (AP Photo/Jason DeCrow)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake appear on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
NEW YORK, NY - DECEMBER 14: Jay-Z (L) and musician Justin Timberlake perform on stage at Barclays Center on December 14, 2014 in the Brooklyn borough of New York City. (Photo by Stephen Lovekin/Getty Images for M2M Construction)
MELBOURNE, AUSTRALIA - SEPTEMBER 18: Justin Timberlake sings live at the opening show of his 20\20 Experience World Tour at Etihad Stadium on September 18, 2014 in Melbourne, Australia. (Photo by Graham Denholm/Getty Images)
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After celebrating her 25th birthday with some of the most famous people in the world, Taylor Swift rounded out her perfect b-day weekend by dancing with Queen Bey.

Beyonce and Swift were spotted in the audience at Brooklyn's Barclays Center on Sunday night, dancing and singing along as Jay Z and Justin Timberlake performed their song "Holy Grail".

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Another concertgoer also caught the "Blank Space" singer dancing with pop trio Haim during JT's show. The sisters and Swift were celebrating Alana Haim's 23rd birthday. "Happy birthday @babyhaim!" Swift tweeted. "So happy I got to watch you blow out your candles while you were singing a scandalous/perfect rap song. As you do."

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Oh you know just TaylorSwift doing the hula at the #JustinTimberlake show with #JayZ and #Beyoncé hanging in the back. 😳

Un video pubblicato da Lauren Izzy (@izzypizzy81) in data:


Timberlake tweeted after performing in front of his star-studded audience, writing: "Nothing like being at sold-out Barclays with the King of Brookyln... #JT2020Tour."

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This past October, Swift chatted with ET about her famous friends, disclosing what quality she finds most important in a gal pal. "A good girlfriend for me is someone who is an individual and has something that they are deeply passionate about," she said. Check out the video for more of our interview with the 1989 pop star.

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