Taylor Swift, from Pennsylvania and with a country music stopover in Nashville, is now a full-fledged, self-declared New Yorker. She used her 25th birthday and last night's annual Z100 iHeartRadio Jingle Ball to drive home the point.

"It's so good to be home," Swift proclaimed just after she had sung her heart out on "Welcome to New York."

In addition to Swift, other performers at the special event included Pharrell, Sam Smith, Ariana Grande, Maroon 5, OneRepublic, Iggy Azalea and Meghan Trainor.

Roger Friedman of Showbiz411 commented, "Swift, whom I'd seen earlier in the day at the Billboard Women in Power lunch, is efficiently charming, poised, well spoken, and prepared. The girls adore her. When she appears on stage, the shrillness of the screaming is enough to guarantee a mass gathering of canines who can hear only her. Plus, the transformation from country artist to pop mega star is complete (although I think it was already that way a couple of years ago)."

Celebrating her 25th birthday on stage, Swift performed several of her hits, including the new pop hits, "Shake it Off" and "Blank Space."