Welcome to Nellyville!
Taylor Swift provided backing vocals at her own concert, along with girlband Haim, as they were joined on stage by rapper/singer Nelly to perform his hit *Hot In Herre. *
Last night, Nelly took to the stage at the Scottrade Center in St. Louis for Taylor's 1989 world tour to make the ultimate super group.
Tay-Tay shared her excited - as much as feeding our inner 16-year-old-self - by bringing Nelly on stage and she also shared her glee on social media.
"Old friends. @derrtymo has come out to surprise the crowd on my last 3 tours. I absolutely adore him," the Bad Blood singer told her 48.7 million Instagram followers.
After singing *The Fix *with Nelly, Tay-Tay brought Haim on stage and said: "Are you ready for what's about to happen, will you please welcome Haim onto the stage!"
Then, as Nelly exited the stage the trio sister-band - including Este, Danielle and Alana Haim - sang Forever and Let Me Go to the audience.
Taylor should have also called up her pal Justin Timberlake to perform this golden oldie with Nelly:
Beyonce's 10 BEST holiday pictures:
Beyonce's 10 BEST holiday pictures

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