Justin Timberlake had quite a few celebrity fans in the audience for his concert at Brooklyn's Barclays Center over the weekend, as part of his "The 20/20 Experience" Tour.
Taylor at the Justin Timberlake concert with Beyoncé! pic.twitter.com/Mxxiq2XgQ3— Hardcore Swiftie (@Swift13Updates) December 15, 2014
One fan caught them all on Instagram singing and dancing along:
Justin's wife Jessica Biel, who is rumored to be pregnant with their first child together, was also in attendance to watch her hubby do his thing on stage.
Dance along with Taylor, Beyonce, HAIM and Jessica Biel, and watch Justin and Jay perform "Holy Grail" at his star-studded concert below!
Jay Z, Beyonce, Justin Timberlake, and HAIM were also all at Taylor Swift's birthday bash on Friday night after the iHeartRadio Jingle Ball hosted by Z100, along with Sam Smith, Nick Jonas, Selena Gomez and more.
It looks like Taylor Swift had the BEST 25th birthday weekend EVER!
Photos: Splash News & Getty Images