Aretha then led a beautiful rendition of "Happy Birthday" to a shocked Taylor, who could not contain her excitement over the once-in-a-lifetime moment. It was topped off by Taylor blowing out five candles on a birthday cake in front of a packed house.
Hours later, the "Blank Space" singer still couldn't get over Aretha's unexpected birthday present, taking to Twitter to express her deep gratitude.
Aretha Franklin just sang 'Happy Birthday' to me and it will take me decades to recover.
"I turn 25 at midnight tonight, and I fully intend to celebrate like it's 1989,” Taylor said in her speech at the New York City event. "I knew it was a bad joke when I wrote it, and I just did it anyway!"
Meanwhile, Taylor's BFF Selena Gomez was already getting the party started, posting a pic of cool nail art of an "S" and a "T" in celebration of their friendship.