'I want to remind you that anyone you see on the 1989 Tour, coming out to surprise the audience, they're doing it for free, out of the goodness of their heart, because they wanted to come play for you and surprise you," Swift told the crowd by way of introduction.

'Something I'm very proud of is that I came up in country music--really proud of it--and I still am such a huge fan of country music, and, in my opinion, the people I'm about to bring out are some of best musicians, some of the best things we've got going in country music," said Swift.