The latest addition to Taylor Swift's BFF posse just may be Beyonce.
At the Justin Timberlake show at Barclays in New York City over the weekend, Jay Z joined Timberlake onstage for "Holy Grail." And cheering along in the VIP section was Beyonce (duh) and Swift -- and fans were quick to capture the moment of the two together, however fleeting it might be.