"Back to December" is a ballad about a breakup, and it is widely believed to be about Swift's relationship with Lautner. The two dated for a few months in 2009, but they broke up in December of that year.
The lyrics of "Back to December" make it clear that the song is about someone who Swift regrets breaking up with. She sings, "I miss your tan skin, your sweet smile / The way you took me by the hand and walked me home from school / I miss your laugh, I miss your hair / I miss the way you made me feel so special."
Swift has never explicitly confirmed that "Back to December" is about Lautner, but she has said that it is a song about someone who she was "really, really close to." Lautner has also said that he believes the song is about him.
In a 2016 interview, Lautner said, "That's what she does. She writes songs." He continued, "It's called 'Back to December.'"
"Back to December" is a popular song among Taylor Swift fans, and it is often cited as one of her best ballads. The song has been praised for its honest and vulnerable lyrics, as well as Swift's powerful vocals.