Celeb social: Swift parties with JT, Jay Z and Bee

Taylor Swift parties with her famous friends including Justin Timberlake, Sam Smith, Jay Z, Beyonce and Haim. Photo / Instagram

Our social media scout Cam Mansel gives you the run down of things you might have missed in the weird and wonderful world of celebrity social media.

Fans got quite a treat at Justin Timberlake's concert as part of his The 20/20 Experience Tour in New York City on Sunday.

The singer was joined on stage for a surprise performance with Jay Z, as none other than Beyoncé and Taylor Swift watched from the audience.

Taylor spun around to laugh with Beyoncé as they sang along and danced to Holy Grail from the VIP section together.

The duo looked like they were having a great time during the evening, in a video captured by an Instagram user.

Taylor was clad in a black top and shiny silver skirt, while Beyoncé wore a tight printed black and white dress as she cheered on her husband.

The two superstar singers were joined by Haim sisters Este, Danielle and Alana, according to Just Jared.

Justin, 33, welcomed pal Jay Z, 45, on stage while performing at the Barclays Center in Brooklyn.

The pair have been close friends for some time now and last year they co-headlined the Legends Of The Summer Stadium Tour from June to August.

Jay Z's song Holy Grail, which Justin - whose wife Jessica Biel is rumoured to be expecting their first child together - features on, came out last July.

Justin's The 20/20 Experience Tour kicked off in November 2013 and will finally be coming to an end on January 2, when he does his final performance in Las Vegas.

On Friday, Beyoncé, Jay Z and Justin were amongst the many celebrity guests at Taylor's 25th birthday party.

Also joining the Blank Space singer at her New York City pizza party were Selena Gomez, Karlie Kloss, Sam Smith, Nick Jonas and Chrissy Teigen.

1 JT concert + Tay Tay + Beyonce = 1 crazy party!

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Everyone needs one of these at Christmas!

Enough to scare the pants off anyone really!

Because all friends greet like this...

That cropping though...

All I want for Christmas is you!

- Daily Mail, nzherald.co.nz