Wednesday, March 20, 2013 2:04pm ET by  
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Taylor Swift surprises 'Red' tour crowd with Nelly duet

Country-pop superstar Taylor Swift performed in St. Louis, Missouri last night (March 19) and treated her fans at the concert to a duet with a special guest.

'Just A Dream' star Nelly, who is from the area, took the stage with the songstress at one point and together they sang his latest single, 'Hey Porsche'. She took to her official Twitter page after the gig and wrote:

"St Louis, you were insanely loud and fun and amazing. Thanks for coming, guys."

"And a huge thank you to @Nelly_Mo for coming out to sing!!!"

Nelly also tweeted about the night's events and even shared a photograph from the show (pictured below), which he accompanied with the caption: "This is how my day went yesterday !!! S/O to @taylorswift13 @taylorswift13 for rockin DaLOU 2 nites back…" Watch their impromtpu collaboration here: