Nelly Joins Taylor Swift On Stage!

Taylor Swift performed in St. Louis Tuesday night...and Nelly was her celebrity guest!

Taylor seems to always have a surprise for her fans wherever she goes. Since Nelly is actually from St. Louis, it made for a pretty good fit (even though half of the people there probably didn't even know who Nelly was).

And...here's Taylor practicing those sick moves with her opening act, Haim:

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